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Example
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$\frac{\cos\:\left(4\theta\:\right)}{\sin\:\left(\theta\:\right)}-\frac{\sin\:\left(4\theta\:\right)}{\cos\:\left(\theta\:\right)}=\frac{\cos\:\left(5\theta\:\right)}{\sin\:\left(\theta\:\right)\cos\:\left(\theta\:\right)}$
55 views
$\frac{1+\cos\left(x\right)}{1-\cos\left(x\right)}-\frac{1-\cos\left(x\right)}{1+\cos\left(x\right)}=4\cot\left(x\right)\csc\left(x\right)$
55 views
$\cos8x+cos4x=2\left(cos2x\right)-4\left(sen^23x\right)\left(cos2x\right)$
70 views
$\frac{\csc\left(x\right)}{1+\csc\left(x\right)}-\frac{\csc\left(x\right)}{1-\csc\left(x\right)}=2\sec^2\left(x\right)$
64 views
$\frac{\cos\left(x\right)}{1-\sin\left(x\right)}-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=2\tan\left(x\right)$
432 views
$cos\left(x-y\right)+cos\left(y-x\right)=2cosxcosy+2sinxsiny$
88 views
$\frac{\cos^2\left(x\right)-\sin^2\left(x\right)}{\cos^2\left(x\right)+\sin\left(x\right)\cos\left(x\right)}=1-\tan\left(x\right)$
74 views
$\frac{\sin\left(10x\right)}{\sin\left(9x\right)+\sin\left(x\right)}=\frac{\cos\left(5x\right)}{\cos\left(4x\right)}$
224 views
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