$$\left(0.51+1.93y\right)\cdot\left(2+y\right)$$

$$f\left(x\right)=7e^{x^2+1}$$

$$\log4\left(x\right)=0.5$$

$$50x^4-30x^3+40x$$

$$\left(\sqrt{x}-y^2\right)\left(\sqrt{x}+y^2\right)$$

$$x^3+y^3=2$$

$$1-\left(1-e^{\left(1-x\right)}\right)^2$$