Trigonometry - Compound and Double-Angle Identities
Trigonometry - Compound and Double-Angle Identities
Given that \( \sin{x} = \frac{1}{3}\), where \(x\) is an acute angle, find the exact value of
- \(\cos{x}\)
- \( \cos{2x}\)
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Answer:(a) \(\dfrac{2\sqrt2}3\) (b) \(\dfrac79\)
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