# Cofunction identities

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###### Topic Notes

Cofunction Identities: Basically, we need the

$\sin(\frac{\pi}{2}-\theta)=\cos(\theta)$

$\sin(\theta)=\cos(\frac{\pi}{2}-\theta)$

$\tan(\frac{\pi}{2}-\theta)=\cot(\theta)$

$\tan(\theta)=\cot(\frac{\pi}{2}-\theta)$

$\sec(\frac{\pi}{2}-\theta)=\csc(\theta)$

$\sec(\theta)=\csc(\frac{\pi}{2}-\theta)$

*of the***sum***and***left***brackets to be 90° or $\frac{\pi}{2}$***right**$\sin(\frac{\pi}{2}-\theta)=\cos(\theta)$

$\sin(\theta)=\cos(\frac{\pi}{2}-\theta)$

$\tan(\frac{\pi}{2}-\theta)=\cot(\theta)$

$\tan(\theta)=\cot(\frac{\pi}{2}-\theta)$

$\sec(\frac{\pi}{2}-\theta)=\csc(\theta)$

$\sec(\theta)=\csc(\frac{\pi}{2}-\theta)$

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