$\lim_{x\to\frac{\pi}{3}}\left(\frac{\sin\left(3x\right)}{1-2\cos\left(x\right)}\right)$

$y-y^2=y^2-3$

$\sqrt{3a}\cdot\sqrt{15a}$

$25+7x=8x+15$

$x-5\left(x+1\right)=3x+2$

$\int\frac{arcsen\left(x\right)}{x^{\:2}}dx$

$\frac{dy}{dx}\left(ln\left(y+\frac{x}{y}\right)\right)$