$\int\frac{1}{x^2}\left(x+1\right)^3dx$
$\frac{6}{sinx}=\frac{x}{sin45}$
$25x^2y^3-55xy^3$
$\lim_{x\to+\infty}\left(1+e^{2x}\right)^{-2x}$
$\frac{cos\left(t\right)}{1+cos\left(t\right)}-\frac{cos\left(t\right)}{1-cos\left(t\right)}$
$-3a\:si\:a=4$
$-3.\left(-2\right)^2$
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