- #1

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## Homework Statement

2sin

^{2}θ - 1 = sin

^{2}θ - cos

^{2}θ

## Homework Equations

## The Attempt at a Solution

I am unsure of how to prove these.

So far all I have is

Left side= 2sin

^{2}θ - 1

=sin

^{2}sin

^{2}-1

And I know that right side is equal to 1.

But otherwise not sure where to go from there.