$\left(4x+xy^2\right)dx+\left(y^2+x^2y\right)dy=0$

$\int\left(\frac{11\ln\left(x\right)}{x\sqrt{3+\left(\ln\left(x\right)\right)^2}}\right)dx$

$9m^2-16$

$x^2-4x+4=49$

$\lim_{x\to\infty}\frac{2^x+1}{x^4}$

$3\:sen\:x\:-\:cos2\:x\:-\:3\:=\:0$

$-1=\tan^2\left(x\right)-sec^2\left(x\right)$