Sin-2 - - cos-2- - - - 2 sin-sin-cos- - -

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Trigonometric Ratios of Compound Angles

sin^2 α + cos...

Question

${sin}^{2} α + {cos}^{2} (α + β) + 2 sin α . sin β cos (α + β) =$

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Solution

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{sin}^{2} α + {cos}^{2} (α + β) + 2 sin α . sin β cos (α + β) =

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