idanheat idanheat

22-02-2019
Mathematics

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The cosine of a certain third quadrant angle is -0.75. Correct to 3 decimal places, what is its sine?

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Аноним Аноним

22-02-2019

Step-by-step explanation:

The x value is -.75 so you need to use the inverse to find the angle and then use sin x to find the sine.

[tex]sin(cos^{-1}(-.75)) = .66143 = .661[/tex]

Since it is in the third quadrant, put a - sign on .661 so -.661

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