I am trying to solve this integral:
http://www.wolframalpha.com/input/?i=integral+(sin(4x))^2+*+(cos(4x))^2
and I was just wondering what I am doing wrong (my work is attached).
Any input would be greatly appreciated!
Thanks in advance!
Hello,
You did a substitution then you ignore it.
you have mistake in the third line. The denominator should be 4 not 2.
And you forgot the twice.
Its better to evaluate by the substitution , which will make it: