$\sin\left(125\right)\cos\left(35\right)-\cos\left(125\right)\sin\left(35\right)$

$\sqrt{2}x^4-2\sqrt{2x^4}$

$\frac{5x}{x^2-2x-29}-\frac{3}{6-x}-\frac{2}{x+4}$

$\lim_{x\to\infty}\left(\frac{x}{x-1}-\frac{1}{inx}\right)$

$y^4-y^2-12$

$-2y-xy+x^2-y$

$\int\left(ln\left(x+7\right)\right)dx$