$$-45\left(+9-7-63\right)\cdot\left(+5-3-7\right)-8+3$$

$$9b^6b^{10}$$

$$3x-4y\left\{x-\left(x+y\right)-\left[\left(2x+4\right)-x\right]-3y\right\}$$

$$\left(m^2-2\right)^3$$

$$\left(x+z\right)^3$$

$$\cos\left(2\right)x=\left(1+\sin\left(x\right)\right)\cdot\left(1-\sin\left(x\right)\right)$$

$$x^2-8x+31>0$$