$\frac{4a^2b}{8a}\cdot\frac{4a^3b^2}{a^2b^5}$

$2x^4-1x^2y+3y^2-2x^4-5+2y^2+4$

$sin\left(\cos\left(x\right)+\sin\left(x\right)\tan\left(x\right)\right)$

$\frac{dy}{dx}-4x=\sin\left(5x\right)$

$-\left(-36\right)+\left(4\right)-10+100$

$121y^2+22yz+z^2$