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Question
Write the acute angle θ satisfying \[\cos B = \frac{3}{5}\]
Solution
We have: `sqrt3 sinθ = cosθ`
⇒ `sqrt3 sin θ=cos θ`
⇒` sinθ/cos θ=1/sqrt3`
⇒ `tan θ= tan 30°`
⇒`θ=30°`
Hence the acute angle is 30°`
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