How should I know not to use a negative value after taking a square root? In the question I might have thought cos x=-(4/5) and sin x=-(3/5).

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- July 25th 2010, 07:10 AMStuck ManWhy not negative?
How should I know not to use a negative value after taking a square root? In the question I might have thought cos x=-(4/5) and sin x=-(3/5).

- July 25th 2010, 07:12 AMmathaddict