Cofunction Identities

	$\displaystyle \sin\left(\frac{\pi}{2}-x\right)=\cos x$		$\displaystyle \cos\left(\frac{\pi}{2}-x\right)=\sin x$
	$\displaystyle \csc\left(\frac{\pi}{2}-x\right)=\sec x$		$\displaystyle \tan\left(\frac{\pi}{2}-x\right)=\cot x$
	$\displaystyle \sec\left(\frac{\pi}{2}-x\right)=\csc x$		$\displaystyle \cot\left(\frac{\pi}{2}-x\right)=\tan x$