$\lim_{x\to infinito}\left(\frac{e^{x^2}-x^2-1}{ln\left(1+x^2\right)-x^2}\right)$

$2\sin\left(2a\right)\cos\left(2a\right)$

$3w^2-5w+1$

$\int\frac{\ln\left(x\right)^2}{2x}dx$

$\int x^2\sqrt{5+4x-x^2}dx$

$\left(1+2^x\right)^2$

$\frac{\cos\left(x\right)}{-2\cos\left(x\right)\sin\left(x\right)}$