$-5.15\cdot0.9$
$tanx\cdot\frac{1}{cotx}=tan^2x$
$\frac{sin\left(x\right)}{1-sec\left(x\right)}$
$x^{3\:}+y^3\:=\:7$
$\frac{dy}{dx}=\sin^2\left(2x\right)$
$y2+17y+12$
$\frac{9x-8}{x\left(x^2+3\right)^2}$
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