$sin\left(-15\right)=x$
$-4c^3+20c^2$
$4x+1\left(x^2-1\right)$
$\left(+5\right)\left(+\:30\right)+\left(-15\right)\left(+\:4\right)$
$\lim_{x\to0}\left(\frac{\sin^2\left(x\right)+2\cos\left(x\right)-2}{\cos2\left(x\right)-x\sin\left(x\right)-1}\right)$
$\frac{700}{100}$
$\int_0^1e^{-x}dx$
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