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cos( α + β) with the following information: sin α = 4/5 (α in the first quadrant) and cos β = -12/13 (β in the second quadrant)

/in /by

cos( α + β)
with the

following information: sin α = 4/5 (α in the first quadrant) and cos β = -12/13 (β in the second quadrant)

 
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