$\frac{sina}{1+cosa}+\frac{sina}{1-cosa}$

$\sqrt{x+7}+x=5$

$\lim_{x\to x}\left(x\csc x\right)$

$\int\left(7x^3\left(9-4x^4\right)^5\right)dx$

$9x^2+7x+5-3x^2+5x-2$

$\arccos\left(2.0\right)$

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