$94.963=r\tan\left(\frac{i}{2}\right)$
$\left(-a+1\right)\left(-a-1\right)$
$y'=\sqrt{1-4x}$
$cos\:s\:=\:\frac{1}{3},\:sin\:t\:=\:-\frac{1}{2},\:find\:cos\left(s+t\right)$
$x5-5x^4+8x^3$
$\int\left[ln\:4x\right]^2dx$
$\int\frac{2x+3}{\sqrt{x+3}}dx$
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