$\log\left(x\right)^2=log\:\left(x\right)^4$

$2-2\sin\left(x\right)$

$\frac{cos\left(a\right)cos\left(b\right)+sin\left(a\right)sin\left(b\right)}{cos\left(a\right)cos\left(b\right)}$

$3x^2-2x-10$

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

$\left(1-\cos\left(x\right)\right)\left(1+\left(\frac{1}{cos\left(x\right)}\right)\right)=tan\left(x\right)sin\left(x\right)$

$\int x^3\left(2+3x^4\right)^2dx$