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bija089 [108]
3 years ago
9

Can somebody please help me? (PreCalc)

Mathematics
1 answer:
SashulF [63]3 years ago
7 0
\csc\theta=\dfrac1{\sin\theta}=\dfrac{\sqrt{17}}}4\implies\sin\theta=\dfrac4{\sqrt{17}}

Recall that \sin^2\theta+\cos^2\theta=1, which means

\cos\theta=\pm\sqrt{1-\sin^2\theta}=\pm\sqrt{1-\dfrac{16}{17}}=\pm\dfrac1{\sqrt{17}}

Since \tan\theta=\dfrac{\sin\theta}{\cos\theta}>0, and \sin\theta>0, it follows that \cos\theta>0 too, so you take the positive root:

\cos\theta=\dfrac1{\sqrt{17}}

Therefore

\cot\theta=\dfrac{\cos\theta}{\sin\theta}=\dfrac{\frac1{\sqrt{17}}}{\frac4{\sqrt{17}}}=\dfrac14
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