$15x-9<6x-13$
$\left(\cos\left(x\right)+3\sin\left(x\right)\right)^2=5-4\cos\left(2x\right)+\sin\left(2x\right)$
$x\:-20\:=\:54$
$\cos\left(x\right)=2$
$\frac{dy}{dx}=\left(y+1\right)\left(2x^3+3\right)$
$3x^2-2x+1\:.\:x-2$
$\frac{652-x^4}{5+x}$
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