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01-10-2020
Mathematics

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Find cos2θ if sinθ=11/61

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01-10-2020

Answer:

given cos(2θ) = 1 - 2 sin²(θ)

=> cos(2θ) = 1 - 2(11/61)²

=> cos(2θ) = 1 - 2* 121/3721

=> cos(2θ) = 1 - 242/3721

=> cos(2θ) = 3479/3721

Step-by-step explanation:

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