$-1+4cos2x=cos\:2x$
$\sec\left(a\right)\cos\left(a\right)-\cot\left(a\right)=\tan\left(a\right)$
$\cos\:\left(\frac{\pi\:}{4}-x\right)=\frac{1}{2}$
$\left(5m^2+2n^5\right)^2$
$1x+\frac{1}{2}$
$\left(-5\right)^2\left(4\right)$
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