$$5cos^2x+3sin^2x=3+2cos^2$$

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

$$2\cdot\left(7\right)^3+27\cdot\left(-\frac{1}{2}\right)^2+84\cdot\left(7\right)-49$$

$$12x^2+4x-3x^2+8+10x+3$$

$$\left(4x^5y^7\right)\left(2x^2y^{-5}\right)^2$$

$$\frac{sen2x+cos2xsen2x}{sen2xsen2x}$$