1. ## Calculus with trig

I've been revising for my exams and the following problems have confused me:
All are to be differentiated
3x^2cos^4*2x

1 + sinx
1 + cosx

x
1 + cos^2x

If you would be so kind to include your working I would be ever so grateful.
Mouseman

2. Originally Posted by Mouseman
I've been revising for my exams and the following problems have confused me:
All are to be differentiated
3x^2cos^4*2x

1 + sinx
1 + cosx

x
1 + cos^2x

If you would be so kind to include your working I would be ever so grateful.
$3x^{2\cos^{4}{2x}}$