$$4x^2y^3+x^2y^3-5x^2y^3-5x^2y^3-2x^2y^3$$

$$\frac{dy}{cos^2y}=2\sqrt{x}dx$$

$$4^35^2-3^2$$

$$3a^2.-3a^2.\left(-2a^4\right)^3$$

$$\lim_{x\to2}\left(\frac{1-sin\left(x\right)}{csc\left(x\right)}\right)$$

$$\sqrt{3}-2\sin\left(\frac{1}{3}x\right)$$

$$8x^4-24x^2+18$$