If Sin x = -¼, where π < x < 3π∕2 , find the value of Cos 2x

Rob Rolnick asked May 13, 2022

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15 votes

Rob Rolnick asked May 13, 2022

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21 votes

Answer: 7/8

Cos2x has 3 formulas, Sinx is given in the question, we should use the formula with sinus. I guess that's the solution.

Erdekhayser answered May 20, 2022

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