Question

prove that π =22/7 also who is discovered it.

Answer 1

pithogerus has envented it

Answer 2

That the integral is positive follows from the fact that the integrand is a quotient whose numerator and denominator are both non-negative, being sums or products of powers of non-negative real numbers. Since the integrand is positive, the integral from 0 to 1 is positive because the lower limit of integration is less than the upper limit of integration.

It remains to show that the integral in fact evaluates to the desired quantity:

$Archimedes \: of \: Syracuse \: discovered \: \pi$
PYTHAGORAS INVENTED THE VALUE OF PI IS 22/7