$$\frac{d}{dx}\left(10-\frac{40}{x^2}\right)\cdot\cos\left(y\right)$$

$$\ln\left(x+4\right)+\ln\left(3\right)=\ln\left(x\right)$$

$$\int\:\sqrt{a^2-v^2}dv$$

$$7x^6\left(x^4-7x\right)$$

$$144x^2-10x+25$$

$$f\left(x\right)=\frac{1}{x^2+1}\:en\:\left|0,1\right|dx$$

$$-2a\left|\left(a-2b\right)\left(a+2b\right)\right|^2$$