$$-3x^2+21x-30=0$$

$$\int_0^4\left(x^2e^{\frac{x}{2}}\right)dx$$

$$\lim_{x\to0}\left(5\left(sinx\right)^x\right)$$

$$\frac{dx}{dt}=\frac{1}{2x}$$

$$\int_{-2}^25x-3dx$$

$$\left(4a^{a+1}+7y^{b-2}\right)^2$$

$$\int\frac{1}{\left(x+2\right)\left(2x+3\right)}dx$$