$$30\cdot6$$

$$\frac{sin\left(3x\right)}{sinxcosx}=4cosx-secx$$

$$\left(\frac{2}{5}x^3-6y\right)\left(\frac{2}{5}x^3-6y\right)^2$$

$$5x^2-2x-1$$

$$g'\left(w\right)=\frac{4}{9w^4}+5\sqrt{w}$$

$$\frac{4x^2+14x+10}{x+2}$$

$$\int\frac{2x^3+10x}{x\left(x+1\right)^2}dx$$