cos(A - B) = (A) cosA.cosB + sinA.sinB (B) cosA.cosB – sinA.sinB (C) cosA.sinB + sinA.cosB (D) sinA.cosB – sinB.cosA
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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