$$3x+5a-2x+3a$$

$$\sin\left(7x\right)\cos\left(2x\right)-\sin\left(5x\right)\cos\left(4x\right)$$

$$\int\left(10\right)cos^2\left(x\right)dx$$

$$\frac{3x^2-bx^4}{9x^3-12x^2}$$

$$\frac{dy}{dx}=\sqrt{3x+2}y\left(1\right)=5$$

$$\frac{dy}{dx}=10x+3\sqrt{x}$$