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

$\left(-\frac{1}{2}\cdot a-\frac{2}{3}\cdot b\right)\cdot\frac{2}{5}a^2\cdot b$

$\left(2p+2q\right)^3$

$\left(4a^2-3b^3\right)^2$

$\int\:\frac{x+4}{x\left(x^2+4\right)}dx$

$\int_1^4\frac{ln\left(1+x\right)}{2\sqrt{x}}dx$

$\left(\:x\:-\:0.9\:\right)\left(\:x\:+\:4.2\:\right)$