$\frac{1-\sin\left(x\right)}{1+\sin\left(x\right)}+\frac{1+\sin\left(x\right)}{1-\sin\left(x\right)}$

$2+2x=20$

$7x^2+9x-10-3x^2-8x+2$

$12.021+6.9$

$\left(8x\:cos\left(9x\right)\right)dx+\left(6y^5+6\right)dy=0$

$\cos\left(x\right)=-\frac{\sqrt{21}}{5}$

$\int\left(\sec^4\left(\frac{3x}{2}\right)\cdot\tan^2\left(\frac{3x}{2}\right)\right)dx$