cos(A - B) = 

(A) cosA.cosB + sinA.sinB 

(B) cosA.cosB – sinA.sinB 

(C) cosA.sinB + sinA.cosB 

(D) sinA.cosB – sinB.cosA

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1 Answers

Correct option is: (A) cosA.cosB + sinA.sinB

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