$\int\frac{1}{2}sen\left(\frac{1}{3}x+3\right)\cdot cos\left(-\frac{1}{2}x\right)dx$

$3\left(x^{2}-2yz+y^{2}\right)-4\left(x^{2}-y^{2}-3yz\right)+x^{2}+y$

$\lim_{x\to0}\left(\frac{\sin^2\left(x\right)+2\cos\left(x\right)-2}{\cos2\left(x\right)-x\sin\left(x\right)-1}\right)$

$\left(9x-9\right)\left(9x+9\right)$

$x^4-12^2+3$

$x+12x+35$

$\int\frac{x}{\cos^2\left(9x\right)}dx$