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Alternative Double-Angle Forms
$$\cos2x=2\cos^2x-1$$
and:
$$\cos2x=1-2\sin^2x$$
Usage
- Used to convert between powers of sine or cosine and double-angle expressions.
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Alternative Double-Angle Forms
$$\cos2x=2\cos^2x-1$$
and:
$$\cos2x=1-2\sin^2x$$
Usage
- Used to convert between powers of sine or cosine and double-angle expressions.
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