$6y^2-7y-20$

$\left(3x^n+2y^3\right)\left(3x^n-2y^3\right)$

$\sqrt{5u^5w^4}\cdot\sqrt{20u^3w^7}$

$\left(3y+4z\right)^3$

$\lim_{x\to0}\left(\frac{4x\cdot\cos\left(5x\right)-1}{sin\left(3x\right)-3x}\right)$

$\lim_{x\to\pi}-\left(1+\sin\left(5x\right)\right)^{\csc\left(x\right)}$

$200+10\log x=40$