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Cosine Half-Angle Substitution
## Formula
If:
$$t=\tan\frac x2$$
then:
$$\cos x=\frac{1-t^2}{1+t^2}$$
## Usage
- Used together with the tangent half-angle substitution to rationalize trigonometric expressions.
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Cosine Half-Angle Substitution
## Formula
If:
$$t=\tan\frac x2$$
then:
$$\cos x=\frac{1-t^2}{1+t^2}$$
## Usage
- Used together with the tangent half-angle substitution to rationalize trigonometric expressions.
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