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Trigonometry Formulas
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Trigonometry
Cosine Double-Angle Identity
\cos(2\theta)=\cos^2\theta-\sin^2\thetaRewrites the cosine of a doubled angle using squared sine and cosine.
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Cosine Double-Angle Identity
\cos(2x)=\cos^2x-\sin^2xExpresses the cosine of twice an angle in squared trigonometric terms.
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Pythagorean Trigonometric Identity
\sin^2\theta+\cos^2\theta=1Relates sine and cosine for the same angle.
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Sine Double-Angle Identity
\sin(2\theta)=2\sin\theta\cos\thetaRewrites the sine of a doubled angle as a product.
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Sine Double-Angle Identity
\sin(2x)=2\sin x\cos xExpresses the sine of twice an angle using sine and cosine.
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Sine Half-Angle Identity
\sin^2\frac{x}{2}=\frac{1-\cos x}{2}Relates a half-angle sine square to the cosine of the full angle.
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