livesk4227 livesk4227

14-03-2024
Mathematics

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Find the exact value of cos(α−β) given sin(α)=−4/5 and cos(β)=5/8, for α in quadrant III and β in quadrant II.
a) −15−4√39/40
b) 15−4√39/40
c) −15+4√39/40
d) 15+4√39/40

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