$$8cos\left(2x\right)=8cos^2\left(x\right)-3$$

$$\int_0^3\left(xe^{-2x}\right)dx$$

$$\left(-34\right)\cdot\left(-16\right)$$

$$\frac{a^5\cdot\:a^4}{a^2}$$

$$\frac{2dy}{dx}\:\frac{dy^2}{d^2x}=1$$

$$-541-874$$

$$x+2x^2+x^3$$