Question: how do I do part b with the trig identity? Exercise 6.5 Trigonometric Substitution The integral [ sin(:r) cos(r)da can be com- puted in several

how do I do part b with the trig identity?

Exercise 6.5 Trigonometric Substitution The integral [ sin(:r) cos(r)da can be com- puted in several ways: (a) using the substitution u = sin() (or u = cos(x)) (b) by first using the trigonometric identity sin(2x) = 2 sin(a') cos(a) and then integrating

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