$\int\left(sin\left(105x\right)sin\left(45x\right)\right)dx$

$\lim_{x\to0}\left(\frac{\sqrt{4+xsenx}-2}{x}\right)$

$0.19635\cdot4$

$\int cos\left(x\right)sec^2\left(x\right)\left(sin\left(x\right)\right)dx$

$xy^2=0$

$\frac{14-40}{-2}$

$\int\left(x^2+2\right)^{-3}12x\:dx$