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(Solved): Simplify without a calculator: cos2(22.5)sin2(22.5) ...
Simplify without a calculator:
cos
2
(
22.
5
∘
)
−
sin
2
(
22.
5
∘
)
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![Simplify without a calculator:
\[
\cos ^{2}\left(22.5^{\circ}\right)-\sin ^{2}\left(22.5^{\circ}\right)
\]](https://media.cheggcdn.com/media/92b/92b96fab-ab21-4d3d-a8c1-f4f3ee645052/phpQ4sHCw)