$-cot\left(-x\right)sin\left(-x\right)tan\left(-x\right)$
$l\:=\:csc2x\:+\:csc4x\:+\:csc8x\:+\:ctg8x$
$81m^4+2m^4+1$
$\int x\infty e^{-2x}dx$
$\frac{dy}{dx}+2y=e^{3x},y\left(0\right)=3$
$18-2f+3f$
$\int_0^{\frac{\pi\:}{2}}\:\frac{1}{cos^3x}dx$
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