Answers created by Nghi N.

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• How do you prove cosx/2+sinx/2= 1+tanx/2 ?
  
• What is the frequency of #f(theta)= sin 12 t - cos 5 t #?
  
• How do you find the vertex and intercepts for #f(x) = 10x^2 - 5x + 12#?
  
• How does one find the exact values of sec, tan, and sin given the angle is in standard position whose terminal sides intersect at (-12/37, -35/37)?
  
• How do I solve a sum and difference trig equation for the smallest positive solutions?
  
• How do I solve sec(2x)-7=0 for the four smallest positive solutions?
  
• How do I solve for the two smallest positive solutions for: sin(2x)cos(6x)-cos(2x)sin(6x) = -0.35 ?
  
• Solve equation: (Is my answer correct ?)
  
• Solve equation: (Is my answer correct ?)
  
• If 0*<theta<360*, find all values of theta, 2sintheta = 5costheta?
  
• How do I evaluate sin from cos and use symmetry arguments?
  
• Sin x cosec x/8=?
  
• How do you find two solution to #sin(x) = 1/2#?
  
• Why does sin(90 + angle ) =cos angle because on using above property it should br - cos angle?
  
• How to prove: cos^2(2x) - sin^2(x) = cos(x).cos(3x)?
  
• How do you sketch the angle whose terminal side in standard position passes through #(-9,-40)# and how do you find sin and cos?
  
• If tanx= -1/3, cos>0, then how do you find cos2x?
  
• How to prove: cos^2(2x) - sin^2(x) = cos(x).cos(3x)?
  
• How do you factor and solve #-x^2-2x+3 = 0#?
  
• 3(x-2)^2 -5 what is the vertex?
  
• Solve #2csc^2x = 2sec^2x#?
  
• How do you solve cos 2x − 2 sin2 x = 0 interval (−5, 5]?
  
• How do you solve this system of equations: #3x + 2y \leq - 1; x + 4y > - 12#?
  
• How do you factor completely #8x^3-20x^2+6x-15#?
  
• #2arctan(1/2)+arctan(1/7)=#?
  
• How do you solve ?
  
• How do you use a calculator to approximate #tan^-1(-95/7)#?
  
• Shouldn't the answer to this problem be A, not D. Since we are working with the second quadrant, would it be negative... or did I just do it completely wrong? Thank you so much for your help!
  
• How do you simplify #(\sec \theta + \tan \theta ) ^ { 2}#?
  
• How do you solve #cot^2theta=sqrt3 cottheta# in the domain #0<=theta<=360#?
  
• How do you find the exact values of sin 2u, cos 2u, and tan 2u using the double-angle formulas?
  
• How do you find the values of #theta# given #csctheta=2#?
  
• How do you find arcsin(-1/2) ?
  
• If x belongs to (0,π/2), the number of solutions of the equation sin7x+sin4x+sinx=0?
  
• Solve 5sinθ+2cosθ=5?
  
• Number of solutions of sinx.tan4x=cosx in (0,π) ?
  
• Number of solutions of sin^2θ+3cosθ=3 in [-π,π] ?
  
• Given that #sin theta cos theta =7/50# and #0^0 < theta < 90^0#. Find the value of #cos theta#.?
  
• Solve:4cosθ-3secθ=2tanθ?
  
• The general solution of equation sinx+sin5x=sin2x+sin4x is?
  
• How do you find cos 11pi/12?
  
• If I have a triangle where #cos u = -5/7# and #sin u >0#, how do I find the sine, tangent, cotangent, secant, and cosecant of the angle u?
  
• Solve: tan²θ-(1+√3)tanθ+√3=0?
  
• How do you find all values of #theta# for which #sec(theta)=2# where #0^° < theta < 540^°#?
  
• If 2cos²(π+x)+3sin(π+x) vanishes then the values of x lying in the interval from 0 to 2π is x=π/6 or 5π/6. Explain how?
  
• Give 2 co- terminal angles and the reference angle for 215?
  
• How do you use the half-angle identity to find the exact value of Cos(-22.5)?
  
• What is the answer of 1-cot²a=?
  
• How do you solve #2sin2xcos2x#?
  
• How do you solve #2cos^2x+cosx -1=0# for #0<=x<=2pi#?
  
• How do you evaluate #csc^-1(-sqrt2)# without a calculator?
  
• Solve cos θ+sin θ=cos 2θ+sin 2θ?
  
• Solving trigonometric equations: Give the two smallest solutions of cos(5theta)=0.1495, on [0,2pi). Where do I begin?
  
• How do you write an equation of the sine function with amplitude of 3 and period of 4pi over 5?
  
• The point #(3 1/2, -7 3/4)# is on the terminal side of an angle in standard position, how do you determine the exact values of the six trigonometric functions of the angle?
  
• If sin theta =4/5& theta is not Frist quadrant ,find the value of cos theta?
  
• Solve #sin^2(x)=cos(x# )for all solutions 0≤x<2π. Ask for X? Give your answers accurate to 2 decimal places, as a list separated by commas
  
• How do you find all solutions to sin (2x + 1) = 0.2?
  
• How do you find the general solutions for #cos(x) = 0.6#?
  
• How do you find the coordinates of the terminal points corresponding to the following arc length on the unit circle: -9π/-4?
  
• How would I solve this? 2sin^2 x - cos(x + pi/2) - 1 = 0 for -pi < x < pi
  
• If #sin theta = 1/4#, theta in quadrant 2, how do you find the exact value of #sin(theta - pi/3)#?
  
• If Tan(x) = 2, and 0 < x < 2pi, find the exact value of Sin(x + pi/4)?
  
• How do you evaluate sin(arccos 3/4)?
  
• What is the value of sin theta given that (5, 12) is a point on the terminal side of theta?
  
• 6x^2-10x-16=0?
  
• How do you graph the inequality #2y>=x-3#?
  
• How do you find the reference angle for #(theta) = 300#?
  
• How do solve the equation? (Find all solutions of the equation in the interval [0, 2π). sin(2x) − sin(x) = 0
  
• Use the product-to-sum formulas to rewrite the product as a sum or difference. 9 cos(−9β) sin 5β?
  
• Find the exact value of the trigonometric expression given that sin(u) = − 3/5, where 3π/2 < u < 2π, and cos(v) = 15/17, where 0 < v < π/2. ? cos(u−v)
  
• Find the exact values of the sine, cosine, and tangent of the angle. 11π/12 = 3π/4 + π/6. how will I determine Sin 11π/12, Cos 11π/12, and Tan 11π/12?
  
• X^2+8x+1<0 Inequality questions What will be the answer ? Plz tell
  
• What is #sin(2 arcsin(3/5))#?
  
• Possible solutions as exact values for #cos theta=1/sqrt(2) # ?
  
• How to solve #tg^2x-(1+sqrt3)tgx+sqrt3<0#?
  
• How to solve #sin3x<sinx#?
  
• Use the fundamental identities to simplify the expression. Please, someone, help me? 1 − cos2 x / sec2 x − 1
  
• Please, how do I factor the expression? Use the fundamental identities to simplify, if necessary. 1 − 2 cos2(x) + cos4(x)?
  
• How do I solve #sinx-sqrt3sin3x+sin5x<0#?
  
• How do you solve #4cos(t)=3 #?
  
• Please, can anyone help me with this help to solve this question?. Verify that each x-value is a solution of the equation. 3 tan^2(5x) − 1 = 0. (a) x = pi/30 (b) x =5pi/30
  
• Sinxcosx=1/2√2?
  
• What is the vertex form of #y=3x^2+4x+1#?
  
• How do you solve #2x²-x+8=0#?
  
• How do you find the zeros, real and imaginary, of #y=-5x^2-3x+29# using the quadratic formula?
  
• Find the value of cos11π/12?
  
• How to solve #1+2cos^2(x+pi/6)=3sin(pi/3-x)#?
  
• How do you simplify #cot (3π/2 - a)#?
  
• Solve the equation #secx=1+tanx#?
  
• What is the period of #f(t)=sin( t /13 )+ cos( (13t)/24 ) #?
  
• 1+tan^2x/2tanx=?
  
• How do you do (sin^4x - sin^2x cos^2x + cos^4x) ?
  
• How do you find the exact values of the six trigonometric function of #theta# if the terminal side of #theta# in the standard position contains the point (5,-8)?
  
• How to solve #cos(pi/4-x)=sin(pi/6+x)#?
  
• How do you solve #4x^2+17x+15=0#?
  
• How do you sketch the angle whose terminal side in standard position passes through (-8,15) and how do you find sin and cos?
  
• The point #(-4,1)# is on the terminal side of an angle in standard position, how do you determine the exact values of the six trigonometric functions of the angle?
  
• Sin (alpha-540°) Explain and Answer The Value?
  
• If #0 < x < phi# , prove that : #sin (x/2) = sqrt((1-cos x)/2)# ?
  
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