$sec^2x=\:3+\:tan\:x$
$\lim_{x\to\infty}\left(3xe^{\frac{6}{x}}-3x\right)$
$\frac{x^3-3x^2+4x-5}{x+2}$
$3x-2\left(50-x\right)=95$
$\left(\:7a\:-\:5b\right)\left(7a+5b\right)$
$-x^2+x^3-x^4$
$cot\left(-x\right)cos\left(-x\right)+sen\left(-x\right)=-csc\:x$
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