$a+\frac{2a+2b}{5}$
$-4cos\left(x\right)-12=2\cos\left(x\right)-6$
$x^8+5x^4+4=\left(x^4\:+4i\right)\left(x^4-i\right)$
$\frac{3x^2y^3+5a^2x^4}{3x^2}$
$\left(t+4\right)^2$
$\frac{\sqrt{-231}}{4}$
$\int e^{-15x}\cdot\cos\left(1+4x\right)dx$
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