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[" 15.If "sec5A=cosec^(2)5^(@)+sin^(2)10...

[" 15.If "sec5A=cosec^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+......+sin^(2)90^(@).],[" If.Evaluate: "sin^(@).]

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sin^(2) 5^(@)+sin^(2) 10^(@) +sin^(2)15^(@)+...+sin^(2) 180^(@)=

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