$$\frac{dy}{dx}=\frac{x^2}{4y^2}$$

$$\sqrt{363x^2}$$

$$6x\left(6x-y\right)-2-2\left(-y-6x\right)$$

$$\lim_{x\to1}\left(\frac{\ln\left(1+x\right)-\sin\left(x\right)}{\sin\left(x\right)}\right)$$

$$\log\left(x+6\right)-\frac{1}{2}\log\left(2x-3\right)=2-\log\left(25\right)$$

$$1-cotx=cscx-2cotx$$

$$\left(5a\:-\:6b\right)\:\left(2a+3b\right)$$