$$-\left(x+3\right)x<18$$

$$14x^2y^2-28x^2+56^2.^2$$

$$a^2x^2-2axby+b^2y^2$$

$$\int\left(49+x^2\right)^{-4}dx$$

$$-\frac{5}{5}ab^2-\frac{1}{2}ab^2+ab^2-\frac{8}{8}ab^2$$

$$\cos\left(2x\right)-\sqrt{3}\cdot\sin\left(x\right)+\cos^2\left(x\right)$$