Questions asked by Ho Kae Boon

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• If A is at third quadrant. Then (A/2) should be at what quadrant?
  
• Prove : #((Sin 2A ) / (2 sin 3A) )(4(cos 2A)^2 -1)# = cos 3A ?
  
• Without using calculator, evaluate: Cos100cos120cos140cos160 ?
  
• An object lies 10cm in front of a convex mirror of radius of curvature 8cm. If a convex lens is placed 4cm in front of the convex mirror, the final image coincides with the object. Find the focal length of this lens. How to calculate???
  
• Given f(x)=(2x+1)/(x-2) ,and x does not equal to 2.. find f^11(x)??
  
• How do you sketch the graph of f(x)=(x+1)^(-1)???
  
• How to find x? If y=x^2-4x
  
• How to solve this?
  
• How can i prove that #h(x)=f(x-5)# when i know that #f(x-3)=g(3x-2)# , #g(3x+1)=h(x+3)# ??
  
• how to solve this ???
  
• How to solve this ???
  
• Which one is the correct one??
  
• How to solve this vector question??
  
• What is the difference between acceleration, average acceleration and constant acceleration???
  
• What is the oxidation number of hydrogen in H2 ??
  
• How can I deduce the balance equation for magnesium sulphide using half equation method(ion-electron method)???
  
• How to determine which one undergoes oxidation and which one undergoes reduction? For this equation.
  
• A bird flies north at 20 #ms^-1# for 15second and then flies west at #25ms^-1# for 10second. Find the average acceleration for the whole trip. Solution???
  
• How do you factorize #xy(x^2-y^2)+yz(y^2-z^2)+zx(z^2-x^2)# ?
  
• When the polynomial #f(x)=x^32+3x^21-2# is divided by #x-1# , the quotient and remainder are #Q(x)#and R respectively. Find the remainder when #Q(x)# is divided by #x+1#. How do you solve this ?
  
• Given that when #(x^2+x-2)# divides #f(x)=x^3+ax+b# and #g(x)=2x^3+3x^2-1# respectively, the remainders are the same. Find the value of #a-b# ?
  
• Solve the equation : #(x^2+14x+24)(x^2+11x+24)=4x^2# ?
  
• Solve the equation #(2x-3)(2x-1)(2x+1)(2x+3)=3465# ?
  
• Given that #f(x)=(x-2)^5+2(x-2)^4+3(x-2)^3+4(x-2)^2+5(x-2)+6#. If #f(x)=a(color(red)(x+2))^5+b(x-2)^4+c(x-2)^3+d(x-2)^2+e(x-2)+f#. Find the values of #a,b,c,d,e,f# ?
  
• Which of the curves in the graph below best represent the vertical component Vy of the velocity versus the time t for a projectile fired at an angle of 45 above the horizontal??
  
• A dart is thrown horizontally toward X at #25# #ms^-1# as shown in figure. It hits Y #0.12# #s# later. The distance XY is?
  
• A ball s projected from a point on horizontal ground. The speed of projection is 30 m/s and the greatest height reached is 20 meter. Assuming no air resistance, find the angle of projection above the horizontal ?
  
• A basketball player who is 2m tall is standing on the floor 10m from the basket. The height of the basket is 3.05m. If he shoots the ball at an angle of 40degree with the horizontal ,at what initial speed must he throw so that it goes through the hoop??
  
• How do you solve the equation #6x^6+x^5-34x^4+34x^2-x-6=0# ?
  
• From the Electrolysis of concentrated copper(ii) sulphate using carbon electrodes, what product will I get ?
  
• If #sqrt2# lies between #(x+3)/x#and #(x+4)/(x+1)#, find the integral value of #x# ?
  
• If #a/b >1#, and #c# is a positive integer, prove that #a/b>(a+c)/(b+c)# ?
  
• Ammonium chloride and sodium oxide are mixed in a boiling tube and then heated. Write balanced equation based on the chemical reaction described. State the chemical test if necessary?
  
• #cos2x=cosx+sinx# find the general solution ?
  
• A projectile is fired in such a way that it's horizontal range is equal to three times it's maximum height. What is the angle of projection?
  
• Projectile Motion ?
  
• A 5kg block rests on a 30° incline. The coefficient of static friction between the block and the incline is 0.20. How large a horizontal force must push on the block if the block is to be on the verge of sliding a)up the incline, b)down the incline ?
  
• Momentum ?
  
• Elements in the same group in the periodic table exhibits same oxidation state. Is this statement true?
  
• The number 4 is reduced by #1/3#, what does this mean?
  
• Choose the correct one: a)I want to buy either this or that. b)I either want to buy this or that. ?
  
• #6(tanx)^2-4(sinx)^2=1#. Solve x?
  
• Arrange the size of Na, Na+ ,Cl,Cl- in increasing order?
  
• Solve #(3*(-1/3)^(x-1))^2<0.001# ?
  
• A rumour was spread by 4 man at 9:00am. In a period of 15 minutes,each of the 4 man told the rumour to another 3. For the following 15 minutes,each of the man told the rumour to another 3 who have yet to hear it. At 11:00am, how many man had heard it?
  
• A,b,c are three distinct positive numbers. Prove that #ba^2+ab^2+bc^2+cb^2+ca^2+ac^2<2(a^3+b^3+c^3)# ?
  
• #(1)+(1+3)+(1+3+5)+......+(1+3+5+...+21)#?
  
• Simplify #(sqrt(1+2x)-3)/(sqrt(x)-2)# ?
  
• If #lim_{x\to\4}(f(x))=0#, find the value of #lim_{x\to\4}(x*f(x))# ?
  
• #lim_(x->4) (sqrt(1+2x)-3)/(sqrtx-2)# ?
  
• How to solve#lim_(x->2)(2-sqrt(8-x^2))/(x-2)# ?
  
• How to solve #lim_(x->0)((1/(x(sqrt(x+1))))-1/x)#?
  
• A boy and his sister are included in a group of 8 boys and 6 girls. In how many ways can a tennis four( 2 boys and 2girls) be selected so as not to include both the boy and his sister?
  
• #lim_(x rarr 1) (x^3+x)/(x(x-1))# ?
  
• If #lim_(x->0)(1/x^3)(1/sqrt(1+x)-(1+ax)/(1+bx))# exist, find the values of a, b. How can i solve this?
  
• Four persons enter a railway carriage in which there are six seats, in how many ways can they take their place?
  
• 8 people are divided evenly into 2 groups, find the number of ways to divide them?
  
• Given that #lim_(x->oo)((x^2)/(1+x)-ax-b)#, find the values of #a# and #b# ?
  
• #lim_(n->oo)(9*9^(1/3)*9^(1/9)*9^(1/27)*......*9^(1/(3^n))# ?
  
• #a_1=1/1^2# #a_2=1/2^2+2/2^2# #a_3=1/3^2+2/3^2+3/3^2# #a_4=1/4^2+2/4^2+3/4^2+4/4^2# #a_n=#?
  
• #lim_(x->oo)((sqrt(x)/(|__x__|))#?
  
• #lim_(x->-oo)(x*|__(1/x)__|)#?
  
• #lim_(n->oo)(sum_(k=1)^n(sqrt(2n^2+k)/(2n^2+k)))#?
  
• If function #f# is differentiable at #c#, simplify #lim_(h->0)((f(c+h^2)-f(c))/h)#?
  
• Thermochemistry problem?
  
• Is #x^2>0# a statement or non-statement ?
  
• If#2m^2=p^2# Prove that #2#is a factor of #p#?