How would I prove cos(x-y)/cosxcosy=1+tanxtany

aamm Posts: 1, Reputation: 1

New Member

Jan 23, 2008, 08:30 PM

how would I prove cos(x-y)/cosxcosy=1+tanxtany

how would I prove cos(x-y)/cosxcosy=1+tanxtany

jiten55 Posts: 105, Reputation: 8

Junior Member

Jan 24, 2008, 01:16 AM

cos(x-y) = cosx cosy + sinx siny

divide both sides by cosx cosy

(remember: sinA/cosA = tan A)

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