$$cos^{-1}b=\frac{29}{36}$$

$$\int\frac{5x+1}{x\left(x-3\right)\left(x+2\right)^2}dx$$

$$\frac{1}{x+3\left(x+1\right)}$$

$$9x+9y=z$$

$$\int\frac{8x^3}{\sqrt{2x^4+18}}dx$$

$$8\cdot10$$

$$\int\:\frac{9x^2\left(3x^3-1\right)^{\frac{3}{4}}}{4}dx$$