数学公式测试页面

$$i={sqrt[{n}]{left({frac {FV}{PV}}right)}}-1$$ $$alpha+beta=gamma$$ $$x = {-b pm sqrt{b^2-4ac} over 2a}.$$ $$ax^2 + bx + c = 0$$ $$sum_{i=1}^n a_i=0$$ $$f(x)=x^{x^x}$$ $$f(x_1,x_x,ldots,x_n) = x_1^2 + x_2^2 + cdots + x_n^2$$ $$f(x,y,z) = 3y^2 z left( 3 + frac{7x+5}{1 + y^2} right).$$ $$left. frac{du}{dx} right|_{x=0}.$$ $$sum_{i=1}^{2n}$$ $$sum_{k=1}^n k^2 = frac{1}{2} n (n+1).$$ $$int_a^b f(x),dx.$$ $$int_0^{+infty} x^n e^{-x} ,dx = n!.$$ $$int cos theta ,dtheta = sin theta.$$ $$int_{x^2 + y^2 leq R^2} f(x,y),dx,dy = int_{theta=0}^{2pi} int_{r=0}^R f(rcostheta,rsintheta) r,dr,dtheta.$$

and

$$int_0^R frac{2x,dx}{1+x^2} = log(1+R^2).$$