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A=πr^2

(-b±√(b^2-4ac))/2a

f(x)=a_0+∑_(n=1)^∞9618;(a_n cos8289;〖nπx/L〗+b_n sin8289;〖nπx/L〗 )

cos8289;α+cos8289;β=2cos8289;〖1/2 (α+β)〗 cos8289;〖1/2 (α-β)〗