$6x^3-7x^2+4+4x^2-1-5y^3+x^2$

$\lim_{x\to1}\left(\frac{ln\:x}{x^2-1}\right)$

$\frac{dy}{dx}=y^{\left(\frac{2}{3}\right)}$

$\lim_{n\to\infty}\left(\frac{n}{2}r^2\sin\left(\frac{2\pi}{n}\right)\right)$

$2sin\left(x\right)^2-5cosx+1=0$

$\frac{50}{\left(cos\:87^{\circ}+cos\:84.2^{\circ}\right)}$

$5x-9-2x+11$