$\frac{120}{60}$

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

$\frac{cot^2\left(x\right)}{1+cot^2\left(x\right)}\:x\:\frac{1+tan^2\left(x\right)}{tan^2\left(x\right)}$

$-8-15-19,4-29,100-1$

$2x+3=1$

$\left(1-\sin^2\left(a\right)\right)\left(1+\tan^2\left(a\right)\right)$

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