$\sin\left(x\right)\cdot\left(\sin\left(x\right)+1\right)$
$\frac{cos^3\left(x\right)-cos\left(x\right)}{sin^2\left(x\right)}$
$-\sin\:a-1=3sina+2$
$\int_1^3\left(e^{-3x}\right)dx$
$\int_1^{\infty}\left(\frac{x+2}{x^2+4x}\right)dx$
$x^2+x-13$
$2+4x-3x^2$
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