$$\tan\left(a\right)\sec\left(a\right)-\sin\left(a\right)=\sin^3\left(a\right)\sec^2\left(a\right)$$

$$6\frac{dy}{dx}=\left(2x+1\right)\left(y^2-2y-8\right)$$

$$y'=y+2$$

$$cos^2x-sin^2x=1$$

$$72\cdot13$$

$$10cv+8c^4v^2-30c^3$$

$$2+ab\cdot5ab-2$$