$\tan\left(2a\right)=\frac{2\:tana}{1-tan^2a}$

$\int_0^{.6}\frac{x^2}{\sqrt{9-25x^2}}dx$

$525cm\cdot3$

$x^3raiz\left(x^2-4\right)$

$12-\left|2+\left(-4-3\right)-\left(-4+2\right)\right|+4$

$\lim_{x\to0.01}\left(\frac{sen\:2x}{4x}\right)$

$\arctan\left(-\frac{3.0845}{3.6357}\right)$