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Slav-nsk [51]
3 years ago
12

If csctheta=11/4 & tan Thea< 0 Use the fundamental identities to evaluate cottheta.

Mathematics
1 answer:
JulsSmile [24]3 years ago
7 0

Answer:

\cot{\theta} = -\frac{\sqrt{105}}{11}

Step-by-step explanation:

Fundamental identities:

These following trigonometric identities are used to solve this question:

\sin^{2}{\theta}+\cos^{2}{\theta} = 1

\csc{\theta} = \frac{1}{\sin{\theta}}

\cot{\theta} = \frac{\cos{\theta}}{\sin{\theta}}

With the cossecant, we can find the sine. So:

\csc{\theta} = \frac{1}{\sin{\theta}}

\frac{11}{4} = \frac{1}{\sin{\theta}}

11\sin{\theta} = 4

\sin{\theta} = \frac{4}{11}

With the sine, we find the cosine.

Since the tangent is negative, the cosine is negative. So

\sin^{2}{\theta}+\cos^{2}{\theta} = 1

(\frac{4}{11})^{2} + \cos^{2}{\theta} = 1

\frac{16}{121} + \cos^{2}{\theta} = \frac{121}{121}

\cos^{2}{\theta} = \frac{105}{121}

\cos{\theta} = -\frac{\sqrt{105}}{11}

Cotangent:

\cot{\theta} = \frac{\cos{\theta}}{\sin{\theta}}

\cot{\theta} = \frac{-\frac{\sqrt{105}}{11}}{\frac{4}{11}}

\cot{\theta} = -\frac{\sqrt{105}}{11}

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