$\cos\left(a\right)^2\left(\sin\left(a\right)^2-\cos\left(a\right)^2\right)\sec\left(a\right)+\cos\left(a\right)^2=\sin\left(a\right)^2$

$\left(b^7-y\right).\left(-9y^3+3y\right)$

$\left(x+3y\right)\left(x-7y\right)$

$g\left(x\right)=\left(3^2-5\right)\left(5x^3+3\right)$

$f\cdot\sqrt[3]{1n\left(6x\right)}$

$\int\left(\frac{3x^2+x-8}{x^3+4x}\right)dx$

$4x^2-4x+10+2x^2+5x-8$