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

$4\left(2x-2\right)=16$

$\left(cosx-2sinx\right)^2$

$\frac{\left(x^2-6x+9\right)}{\left(5x+15\right)}$

$\int\frac{1}{t^2\sqrt{16+t^2}}dt$

$x^4-x^3y+x^2y^2$

$3\cdot\left(-10\right)+1$