PROve
Asked by | 12th Sep, 2008, 07:54: PM
Expert Answer:
we know that 2sinA sinB = cos(A-B) - cos(A+B)
so cos(3π/4 + x) - cos(3π/4 - x) = - 2 sin x sin3π/4 = -2sin x (1/
2) = -2 sin x
Answered by | 12th Sep, 2008, 09:08: PM
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