Question
What is the value of sin (B – C) cos (A – D)
+ sin (A – B) cos (C – D) + sin (C – A) cos (B – D)?Solution
Here we can absorve a symmetry = A = B = C = D = 0 = sin 0 cos 0 + sin 0 cos 0 + sin 0 cos 0 = 0 + 0 + 0 = 0
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