Question

Simplify: cos^2(3t) + sin^2(3t)
I was thinking 3 (cos^2 + sin^2) but I don't think that is possible

Answer 1

cos^2(x) + sin^2(x) = 1
so
cos^2(3t) + sin^2(3t)=1

Answer 2

Pythagorean theorem.

Answer 3

Ah so you just ignore the 3 because its the same for both so comes back to the same, my stupid mistake thank you guys!

Answer 4

Yeah, the three is just part of whatever angle it is. That identity is true for all angles.

Answer 5

'ignore' is not the correct word though...