Question

If cos a = 3/5 cosB 5/13 = then cos ^a- B /2
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Answer 1

$answer$

We know, cos(A+B) =−cosC

=cosA.cosB−sinA.sinB

∴cosC=−(cosAcosB−sinAsinB)

=−(6515−654.12)

=−(6515−48)

=6533

I hope it will help you .

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