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

$17-0,5\left(2\right)$

$x^4-37x^2+36$

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

$\int\left(\frac{y^5}{\left(y^3+1\right)^2}\right)dy$

$\int\frac{1}{\left(400+x^2\right)^2}dx$

$\frac{6}{3}+\frac{\left(-5\right)}{3}+\frac{2}{3}$