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Question

If cos3θ=32, 0°<3θ<90°, the value of θ (in degrees) is
  1. 10

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Solution

The correct option is A 10
Given: cos3θ=32
We know that cos30=32
Comparing the two we get,
3θ=30.... (given 0 < 3θ < 90)
θ=10

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