$121 x ^ { 2 } - 81$
$\sqrt[2]{2.4481}$
$\cos\left(2x\right)\cdot\left(-4\csc\left(4x\right)^2\right)$
$1-\tan^2\left(a\right)=\frac{\cos2\left(a\right)}{\cos^2\left(a\right)}$
$\left(2m-n\right)\left(2m+n\right)$
$\frac{8m-22m^2-12+m^4}{m-2}$
$2x+4<-1$
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