2025 WGS P1 Q2

2025 WGS P1 Q2

Secondary 4
4 marks

Given that \(\cos A=\dfrac37\) where \(0\le A\le\dfrac\pi2\), find the exact value of

  1. \(\sin A\)[2]
  2. \(\sin2A\)[2]

Solution:

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Answer:(a) \(\dfrac{2\sqrt{10}}7\). (b) \(\dfrac{12\sqrt{10}}{49}\).

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