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Asked by | 12th Sep, 2008, 07:56: PM
Expert Answer:
this question is incorrect.
since cos(A-B) - cos(A+B) = 2 sinA sinB
so cos(π/4 +x) -cos(π/4 -x) = -2sinx sin(π/4) = -
2 sinx
if it is cos(π/4 +x) + cos(π/4 -x) then it equal to 2 cos x
Answered by | 12th Sep, 2008, 09:12: PM
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