If cos(A–B) –cos(A + B) = x, then the value of x is – McqOptions

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1.	If cos(A–B) –cos(A + B) = x, then the value of x is
A.	2sinAsinB
B.	2cosAcosB
C.	2cosAsinB
D.	2sinAcosB
Answer» B. 2cosAcosB

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