An acute angle satisfies

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

An acute angle α\alpha satisfies sin⁡α=35\sin\alpha = \dfrac{3}{5}. Without finding α\alpha, decide which value is larger: sin⁡2α\sin 2\alpha or cos⁡2α\cos 2\alpha. State the larger value only.

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