Question

Find the value of Cos2 when Cos =15/17

Answer 1

Answer is :-

$\sqrt{ \frac{15}{17} }$

Answer 2

Answer:

cosθ = 15/17.

cos2θ = 2cos²θ-1 = 2× (15²/17²) - 1 = 0.55

cos2θ = 0.55.

Step-by-step explanation:

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