prove that cos130° cos40° + sin130° sin40°=0
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cos (A-B) = cosA×cosB + sinA×sinB
A=130
B=40
A-B = 130-40 = 90
so cos (90) = 0
proved
A=130
B=40
A-B = 130-40 = 90
so cos (90) = 0
proved
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