$y'=arccos\left(2x\right)$
$\lim_{x\to3}\left(x+3\right)\left(x-4\right)$
$\left(f+g\right)\left(x\right)f\left(x\right)=3xg\left(x\right)=-x^2-4x$
$\int\left(5x^{3}-4x^{4}+x\right)\left(x^{2}+2x\right)dx$
$x\:+\:2<3x\:+\:1$
$\left(2y-11\right)\left(y^2-3y-2\right)$
$\tan\left(x\right)^2\cot\left(x\right)^2=\sec\left(x\right)^2\left(1-\cot\left(x\right)^2\right)$
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