$\frac{1}{\cos\left(x\right)^2}-\cos\left(x\right)$

$\int\frac{3-7x+3x^2}{\left(x-2\right)^2\left(x-1\right)}dx$

$3a^3-3+4a^2+8$

$\tan\left(2x\right)+\tan\left(x\right)=1-\tan\left(2x\right)\cdot\tan\left(x\right)$

$-3g^5\cdot4g^6$

$3\cot^2\left(x\right)-4\csc\left(x\right)=1$

$\left(7a^2+2b^3\right)+\left(7a^2-2b^3\right)$