$\frac{1}{\cos\left(x\right)}\left(1-sen^2x\right)$

$\int4\sin\left(x\right)^4\cos\left(x\right)^2dx$

$2sin2x-4sinx=0$

$\left(2-2x\right)^7$

$\lim_{x\to+\infty}\left(\frac{lnx+3x^2}{e^x-2x}\right)$

$2\cos\left(-0.5\right)+\tan^2\left(1.7\right)$

$4x^2-2x-3+6x^2+x-6+2x^2-x+3$