Mathematics, 25.04.2020 00:58 ccompassimvu

Find the exact value of the expressions Bold cos (alpha plus beta ), Bold sin (alpha plus beta )and Bold tan (alpha plus beta )under the following conditions: Bold sin (alpha )equals StartFraction "15 Over 17" EndFraction , alpha lies in quadrant I, and Bold sine (beta )equals four fifths , beta lies in quadrant II.

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