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Prove that by using the principle of ma...

Prove that by using the principle of mathematical induction for all `n in N`:
`1+2+3+.....+n lt (1)/(8)(2n+1)^(2)`

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2014-EXERCISE
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  18. Prove that tan70^(@)=2tan50^(@)+tan20^(@).

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