$$15\cdot\left|-14\right|$$

$$\frac{\tan2x-\tan3x}{1+\tan2x\tan3x}$$

$$\frac{3b^5}{3b^4}$$

$$\left(x+10\right)x\left(x+6\right)$$

$$\int\frac{cos\left(x\right)\cdot sen\left(x\right)}{1-cos\left(x\right)}dx$$

$$\left(9y^3\right)\left(-8y^4\right)$$

$$\frac{1+cos\:2x}{2}+3cos\:x+3$$