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If sin B=-1/3 and B in Q3 find cotB/2?

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  • If sin B=-1/3 and B in Q3 find cotB/2?


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cos² B + sin² B = 1, so cos² B = 1 - 1/9 = 8/9. So cos B = ±√(8/9) = ±(2√2)/3. Since B is in Q3 we know cos B = -(2√2)/3. If you're after (cot B ...
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