$\left(x^3-2x^2+3x+4\right)\cdot\left(8-6x-3x^2\right)$
$\frac{d}{dx}-2y=y^2$
$\sin45+\sin15=2\sin30.\sin15$
$-40cd+16c^2+25d^2$
$\left(x^3+3x^2-5x+7\right)-\left(2x^3-4x^2+5\right)$
$\frac{2a}{a+1}+\frac{5}{2a}=2$
$\frac{1}{b^{-2}}$
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