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

User Soenhay
by
7.6k points

1 Answer

2 votes

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.


sin(cos^(-1)(-.75)) = .66143 = .661

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

User Jschr
by
7.8k points
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