2. Which of the following is a valid trigonometric substitution? (a) If an integral contains 9- 4r2, let 2 Bsin 4. (b) If an integral contains v9x2 ++ 49, let B7 see ). (c) If an integral contains Vr2 – 25, let 5 sin 6. (d) If an integral contains V36 +x2, let ta

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