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1•3 + 3•5 +5•7+……+ (2n-1)(2n+1) = [n(4n²+6n-1)]/3...
1.
1•3 + 3•5 +5•7+……+ (2n-1)(2n+1) = [n(4n²+6n-1)]/3 solve it, if n€N . . . .(PMI) ,
Answer» $$-cos(x+5)+C$$
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