$y^2=x^2$

$3x^4+x^3+5x^2+3x+3+3x^4-4x^3+5x^2+x-1$

$\lim_{x\to0}\left(\frac{1}{cosx}lnx\right)$

$\int\frac{\left(-x^2+3x+8\right)}{\left(2x+3\right)\left[\left(x+2\right)^2\right]}dx$

$\left(3\right)\left(2\right)\left(-30\right)$

$\lim_{x\to0}\left(\left(1+2x\right)^{\frac{3}{x}}\right)$

$\int\left(2x^3-cosx\right)dx$