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how did u go about it? I've tried spliting it into (a+x)^n * (a-x)^n then integration by parts, but i can't get it out. Should i use that special property: integral f(x).dx = integral f(a-x).dx (both with boundries a & 0)???

could someone point me in the right direction for this q, i've had a few attempts boundries = a & 0 I n = (a^2 - x^2)^n .dx for n>=0 show I n = ((2a^2n)/(2n+1)) *I n-1 for n>=1 thanks :)