Question

$cos(a + b) cos(a - b) - sin(a + b) sin(a - b)$
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Answer 1

Answer:

cos (a+b)cos(a-b)- sin(a+b)sin(a-b)

cos (a-b)^2 - sin (a-b)^2

HERE is your answer dear

PLEASE MAKE IT AS BRAINLIST ANSWER DEAR.