Question

Use trigonometric identities to transform the left side of the equation into the right side?

Answer 1

\[\sin ^{2}\theta - \cos ^{2}\theta = 2\sin ^{2}\theta -1 \]

Answer 2

wait for my question you do this?

Answer 3

What?

Answer 4

22 km? I don't know.

Answer 5

Use Sin^2 + Cos^2 = 1

Answer 6

But when it's sin^2 - cos^2, how does that work?

Answer 7

@estudier

Answer 8

If Sin^2 + Cos^2 = 1, what does - Cos^2 equal?

Answer 9

-cos^2 = cos^2?