$\sec\left(50\right)\:-\:\csc\left(40\right)$
$x+x^2-x^2-x^3-x^2-x$
$\left(a+3b\right)\:\left(a-2b\right);a=-1,b=2$
$\lim_{x\to1}\left(\frac{3x^2-2x-1}{x^2+2x-3}\right)$
$432+2a^3$
$-3\cdot1+1$
$-6-2\left(n+9\right)$
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