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3.2IDENTITIES 56. The value of (a18 + a-...

3.2IDENTITIES 56. The value of (a18 + a-18) (as - a-18)(a + a-)(a2 + a 2) is (A) (a + a-') (B)(a-a-') (C)(A) (a? - a) The sum of the series 5 + 13 + 21 + .......+ 181 is (D) (a2-a-12) CZ

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