Answers edited by Swarna Islam

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• Question #786a6
  
• Question #74225
  
• How do you determine #tantheta# given #costheta=1/8, (3pi)/2<theta<2pi#?
  
• Question #2144a
  
• Question #6b51b
  
• Prove #tan^-1 (cot (theta)) /2 = pi/4 + theta/2#?
  
• How do you solve the following system?: #9x +12y = 7 , -2x - 21y = -41#
  
• Prove that tan(A+B)*tan(A-B)=cos²B-cos²A/cos²B-sin²A?
  
• Question #70f00
  
• Question #e7dd8
  
• Question #efef9
  
• How do you find the domain and range of #f(x)=-4+sqrt(x+3)#?
  
• Question #b18b1
  
• If tanA+sinA=p and tanA-sinA=q. Then proove that #p^2-q^2=4sqrt (pq)# ?
  
• A projectile is shot from the ground at a velocity of #15 m/s# at an angle of #pi/6#. How long will it take for the projectile to land?
  
• Question #703cc
  
• Can someone verify this? (cotx-1)/(cotx+1) = (1-sin2x)/(cos2x)