$-7+4-1$
$\frac{\cot^2\left(x\right)-1}{1+\cot^2\left(x\right)}=\cos2\left(x\right)$
$\left(4\cdot a^2\cdot b\cdot10\right)^2$
$-1+-3+5-8+3-11$
$\csc\left(a\right)\tan\left(a\right)\cos\left(a\right)-\cos\left(a\right)^2$
$-63\left(-7\right)$
$\lim_{x\to-2}\left(\frac{\left(3x+6\right)\left(x+3\right)}{\left(x+2\right)\left(x-1\right)}\right)$
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