Hey can anyone help me with question 34 of exercise 9C. I've done it about 10 times and cant get it right.
FInd the antiderivative of:
cos ^5x or (cosx)^5
Ive been doing:
=cosx(1/4 + cos2x/2 + cos^2(2x)/4)
This is the point where I get stuck.
= cosx/4 + cos3x/2 + cos^2(3x)/4
I know its not right. Can anyone help me get to the solution?
Answer: y= sinx -2/3sin^3(x) + 1/5sin^5(x)
Cheers! Been bugging me all yesterday because all the next questions are similar.