$\frac{\cos\left(2a\right)}{\sin\left(a\right)}+\frac{\sin\left(2a\right)}{\cos\left(a\right)}$
$\left(x^{12}-5y^2\right)^2$
$32^4-2x^2$
$-\left(6\:-\:3\:-\:5\right)\:-\:\left(-\:4\:-\:7\:+\:15\right)$
$6x^2+7-3x+6x^2$
$\sin2x=-\cos x$
$b^2-5b-36$
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