$\sin\left(a+b\right)+\sin\left(a\right)\cos\left(b\right)-\cos\left(a\right)\sin\left(b\right)$
$\int8x^3\sin\left(2x^4-8\right)dx$
$\frac{d^2}{dx^2}\left(\:x^2+y^2=4\right)$
$\frac{d}{dx}4x^{\frac{3}{2}}$
$64x^3+y^3$
$\frac{dy}{dx}=-y-8$
$-8+10+20-1$
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