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" (14) "sin^(2)75-sin^(2)15^(@)=sin60^(@...

" (14) "sin^(2)75-sin^(2)15^(@)=sin60^(@)

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The value of sin^(2)15^(@)+sin^(2)25^(@)+sin^(2)65^(@)+sin^(2)75^(@) is

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Show that : cos^(2)60^(@)-sin^(2)60^(@)=-sin30^(@)

Evaluate each of the following :- sin^(2)30^(@)+sin^(2)45^(@)+sin^(2)60^(@)+sin^(2)90^(@)

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sin75^(@)-sin15^(@)=cos105^(@)+cos15^(@)

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sin 75^(@) + sin 15^(@) =

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