$\lim_{x\to0}\left(\frac{x\left(\cos\left(x-1\right)\right)}{\sin\left(x\right)-x}\right)$

$16b^6+8b^3\:k^2+k^4$

$49.7865671\pi24.5-.041003512\pi24.5^2+.038416\pi24.5^3$

$\frac{dy}{dx}=\frac{\left(5x^2+3x\right)}{y^2}$

$y''-6y'+8y=0$

$xe7x\:$

$\sin\left(3x\right)\cdot3\sec\left(3x\right)\cdot\tan\left(3x\right)$