## Extending the Ideas 87

MATHEMATICS · Subjective · AP · AP Precalculus · Trigonometric and Polar Functions · Trigonometric and Polar Functions

Problem

## Extending the Ideas 87. Prove that sin⁡4θ−cos⁡4θ=sin⁡2θ−cos⁡2θ\sin ^{4} \theta-\cos ^{4} \theta=\sin ^{2} \theta-\cos ^{2} \theta.

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