$\left(n-4\right)x^2+2\left(n+3\right)x+3n-14=0$

$6\cos^2\left(x\right)+\sin\left(x\right)=-1$

$\frac{3}{2y}-\frac{5}{4y}$

$\frac{16x^4-1}{2x+1}$

$\lim_{x\to\infty}\left(\frac{2x+xsinx}{x^2+1}\right)$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\ln\sin\left(x\right)}{\left(\pi\:-2x\right)^3}\right)$

$\frac{d}{dx}x^2+yx^2=3$