$$\cos\left(b\right)=\sin\left(b\right)$$

$$\frac{dy}{dx}=\frac{\pi\left(1+x^2\right)t}{12\left(1-t^2\right)^{\frac{1}{2}}}$$

$$arccos\left(sin\left(\frac{\pi}{6}\right)\right)$$

$$\csc\left(c\right)-\cot\left(c\right)=\frac{\sin\left(c\right)}{1+\cos\left(c\right)}$$

$$\left(x+2y\right)^2-\left(x-1\right)^2$$

$$\left(2x^3\:+\:3y\right)\:dx\:+\:\left(3x\:+\:y\:-\:4\right)\:\:\:dy\:=\:0$$

$$3x-7+2x+1$$