$cosa+2tan\:a-\frac{1}{cos\:a}=-\frac{sen^2a+2\:sen\:a}{cos\:a}$

$3a\cdot3a$

$9ab^2\left(\frac{1}{3}a^{-1}\right)$

$\int\frac{x}{\sqrt{\left(10x^2-5\right)}}dx$

$-3-5+2-11-7+4$

$\left[2-3\left(-1\right)-4\right]^2-\sqrt{100}-\sqrt{121}-15\left(7-2\right)$

$\frac{\cos\left(x\right)}{\sin\left(x\right)}+\frac{\sin\left(x\right)}{1+\cos\left(x\right)}=\csc\left(x\right)$