`[frac{2x}{5}-frac{3y}{4}][frac{2x}{5}+frac{3y}{4}]`

3frac{1}{13}+1frac{4}{13}+2frac{3}{13}

cos frac{3pi}{4}-iota sin frac{3pi}{4}

x frac{dy}{dx} = y - xcos^2 frac{y}{x}

frac{dP}{dx} = frac{d}{dx} (x^3) (frac{7-2x}{3})^(4)

Prove that Cos frac{pi}{5} + Cos frac{2pi}{5} + Cos frac{6pi}{5} + Cos frac{7pi}{5} = 0

frac{1}{sqrt7-4} frac{1}{sqrt11-7}

solve the equations: frac{2}{sqrt x} + frac{3}{sqrt y} =2 and frac{4}{sqrt x} - frac{9}{sqrt y} =-1

dy/dx = frac{2x+y}{x}

If z(x+y)= x^2 +y^2 show that (frac{delz}{delx}-frac{del z}{del y})^2 = 4 (1- frac{delz}{delx}+frac{delz}{dely})

int frac{dx}{(1-x)sqrtx}