$3x^2+4x\cdot3x-6$

$-\frac{96.17}{11.8}$

$\lim_{x\to-1}\left(\frac{2x-2}{\sqrt{x}-1}\right)$

$\sqrt{2}cos\left(2t+\frac{\pi\:}{4}\right)$

$\int7x^2\sin\left(4x^3\right)dx$

$\lim_{x\to0}\left(\frac{1-tan\left(x\right)}{cos\left(x\right)-sen\left(x\right)}\right)$

$\left(3x+2y+5x^2+4xy\right)\left(3x+2y+5x^2+4xy\right)$