$88.78-1.79$

$\frac{\left(x+y\right)-x}{\sqrt[3]{x+h}-\sqrt[3]{x}}$

$\frac{d}{dx}x^3-y^3=3x^2y-3xy^2$

$15x^2y^3-12xy^4+18x^3y$

$23\cdot24$

$\frac{\cos\left(2x\right)+\cos\left(2y\right)}{\sin\left(x\right)+\cos\left(y\right)}=2\cos\left(y\right)-2\sin\left(x\right)$

$\int_1^{\infty}\left(\frac{x}{2+x^2}\right)dx$