$\frac{1}{\sin\left(x\right)^2\cdot\cos\left(x\right)^2}=\sec\left(x\right)^2+\csc\left(x\right)^2$

$x^2+13x-30>0$

$\int x^2sen\:\left(9x^3+8\right)dx$

$\sqrt{4x^2}\cdot\sqrt{3x}$

$\frac{dy}{dx}=\left(x^2-x\right)^2+1$

$\lim_{x\to\infty}e^{-4x}x^2$

$\frac{secx}{tanx}=cscx$