Mathematics

Mathematics, 30.07.2020 04:01, des7900

Tan α= 21/20, α lies in quadrant III, and cos β = -5/13, β lies in quadrant II, Find sin ( α + β ) ?

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Tan α= 21/20, α lies in quadrant III, and cos β = -5/13, β lies in quadrant II, Find sin ( α + β ) ?...

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