$$f\left(x\right)=\frac{2}{1+x^3}$$

$$-5^3$$

$$\left(2a^3+3a^2b+3ab^2+b\right).\left(ab\right)$$

$$\left(a^7\right)^2$$

$$\sin\left(5x\right)\cos\left(8x\right)-\cos\left(5x\right)\sin\left(8x\right)=-.85$$

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