$\sec\left(x\right)\cos\left(x\right)\sin\left(x\right)=\sin\left(x\right)$

$\int\left(\frac{7}{3x}\right)dx$

$-2\left(x+1\right)\le4\left(x+8\right)$

$\int\frac{\left(x-1\right)^2\left(x+1\right)}{\left(x^2+1\right)^3}dx$

$2+\frac{1}{x}=3+\frac{2}{x}$

$\int_{0.25}^{0.5}\left(\frac{sec^2x}{tanx}\right)dx$