$3\left(9+4b\right)-\left(9a^2b+7b+11a\right)+7a^2b=0$

$\frac{d}{dx}\left(8x^3+9y^3=64\right)$

$\sin\left(x\right)dx=\cos\left(y\right)dy$

$\frac{d}{dx}\left(2xy^2=2\right)$

$-2+81+2^2$

$\int8x\left(x^2-6\right)^{10}dx$

$\lim_{x\to\frac{\pi}{4}}\left(\frac{\cos\left(x\right)^2}{1-\sin\left(2x\right)}\right)$