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If sin B=1/2 and 90 degrees < B < 180 degrees, what is the value of cos B? Choices A. - √3 / 2 B. -1/2 C. 1/2 D. √3 / 2?

Science & Mathematics by Anonymous 2018-05-25 11:04:09

Social Science

If sin B=1/2 and 90 degrees < B < 180 degrees, what is the value of cos B? Choices A. - √3 / 2 B. -1/2 C. 1/2 D. √3 / 2?

1 answer

  • Anonymous

    B is in quadrant II cos²B = 1-sin²B cosB = -√(1-sin²B) = -√(3/4) = -√3/2

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