Hi I'm stuck in an integration question where you have to do a lot of simplifying before integrating, and one of the steps is beyond me. Here's the question for context;
Here's the mark scheme with a line under the part that I'm unsure on.
I don't know how to go from 1/4sin^2(2θ) to 1/8(1-cos4θ). Thanks in advance.
Here's the mark scheme with a line under the part that I'm unsure on.
I don't know how to go from 1/4sin^2(2θ) to 1/8(1-cos4θ). Thanks in advance.