$8a^2-2a-15$

$\frac{1}{x^2}<100$

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

$\frac{sen\left(x\right)^4-cos\left(x\right)^4}{1-2\cdot sin\left(x\right)^2}=1$

$\left(1+x\right)^n\left(1+\frac{1}{x}\right)^n$

$\frac{36-m^4}{6+m^2}$

$y^{\prime}=-\frac{y\ln x}{x\ln y};y\left(e\right)=e$