X 9 a Use the formula for cos (A + B) to show that cos 2x = 2 cos x - 1. 217 V b
X 9 a Use the formula for cos (A + B) to show that cos 2x = 2 cos x - 1. 217 V b Hence find / cos 2x sin x da Use the substitution x = sinu to find 1 10 de. Vx(1-T) 11 Use the substitution
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