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[" 4.Let "I(n)=int(0)^( pi)(sin x)^(n)dx...

[" 4.Let "I_(n)=int_(0)^( pi)(sin x)^(n)dx,n in N," then "],[[" (A) "I_(n)" is rational if "n" is odd "," (B) "I_(n)" is irrational if "n" is even "],[" (C) "I_(n)" is an increasing sequence "," (D) "I_(n)" is a decreasing sequence "]]

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