Question

Trigonometric Identities help? Just one problem!

Answer 1

Simplify: \[\cos ^{3}(2015x)+\sin ^{2}(2015x)\cos(2015x)\]

Answer 2

Factor out cos(2015)x

Answer 3

Let A=2015x, it will save u a lot of time typing :D

then use cos^2(A) + sin^2(A) = 1 to simplify the expression..

Answer 4

So it's just cos(2015x)?

Answer 5

Correct

Answer 6

Thank you so much! I've been overthinking this problem for 20 minutes :/