$\tan^2+\cot^2+2=\sec^2\cdot\csc^2$
$\int\frac{x+5}{x^2+x-2}xdx$
$\left(2.85\right)\cdot\left(-30.6\right)$
$255-65$
$-2\left(-3\right)\left(-6\right)^{2}+4\left(-6\right)$
$secx-cosx:senxtanx$
$\frac{20x^6}{4x^4}$
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