$\frac{1}{\cos^2\left(x\right)}=\cot^2\left(x\right)$
$42x^n-36x^2^n+\frac{49}{4}$
$\frac{csa\:\left(x\right)}{sec\left(x\right)}=\:cot\left(x\right)$
$\left(6+3i\right)\left(8-5i\right)$
$-98-183$
$8-3\left(-2-5\right)+8\left(-3+7\right)$
$\left(x+6^3\right)$
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