Question Help! (1 Viewer)

[juicystar07]

Hi Everyone,

How do I do this question?
(If it's easy, I'm sorry for being such a noob)

Thankyou in advance!

 

[Nws m8]

= 1/2 integration of (1+cos 8x) .dx

=1/2 (x + sin 8x/8) +C



>>> We know cos^2 x = 0.5 (1+cos 2x) from cos 2x = cos^2 2x - 1

 

[nightweaver066]

= 1/2 integration of (1+cos 4x) .dx

=1/2 (x + sin 4x/4) +C



>>> We know cos^2 x = 0.5 (1+cos 2x) from cos 2x = cos^2 2x - 1

You mean (1 + cos8x) in the first line?