Question: Evaluate (be careful if n = m) St Use the trigonometric identity sin L sin sin a sin b = MTX L dx for

Evaluate (be careful if n = m) St Use the trigonometric identity 

Evaluate (be careful if n = m) St Use the trigonometric identity sin L sin sin a sin b = MTX L dx for n > 0, m > 0. 1 (cos(a - b) - cos(a + b)].

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