$\lim_{x\to5}\frac{\left(x+4\right)^{\frac{1}{2}}}{\sqrt{25-x}}$

$-y\ge4$

$\left(\frac{7}{8}x+9\right)\left(\frac{7}{8}x+15\right)$

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

$\frac{\sin\left(x\right)\cos\left(x\right)}{1-\cos\left(x\right)}=\cot\left(x\right)-\sin\left(x\right)$

$24+3\left(-5+9\right)$

$7\cdot7\cdot7$