$cot^2\left(x\right)-cos^2\left(x\right)=cot^2\left(x\right)\cdot\:\:cos^2\left(x\right)$
$7+4v\ge15$
$\int-e^{4x}dx$
$\left(4x+6\right)\left(2x-3\right)$
$12\cdot3^2-4^3$
$\frac{2x^2y^4}{2xy^4}$
$\frac{1+\cot\:x}{\csc\:x}$
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