deepboi2005 deepboi2005

26-07-2021
Mathematics

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

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screaminmyhead screaminmyhead

26-07-2021

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.

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