Question: 13. (a) By using a double angle formula, show that d.x = In tan + C. sin x (b) Hence, evaluate 2 sin x +

13. (a) By using a double angle formula, show that d.x

= In tan + C. sin x (b) Hence, evaluate 2 sin

13. (a) By using a double angle formula, show that d.x = In tan + C. sin x (b) Hence, evaluate 2 sin x + cos

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