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Sergio [31]
4 years ago
14

If cos(θ) = 6/8 and θ is in the IV quadrant, then fine:

Mathematics
1 answer:
svetoff [14.1K]4 years ago
5 0

Answer:

a) 1

b) \frac{4}{3}

c) = 1

Step-by-step explanation:

We are given the following in the question:

\cos \theta = \dfrac{6}{8}

θ is in the IV quadrant.

\sin^2 \theta + \cos^2 \theta = 1\\\\\sin \theta = \sqrt{1-\dfrac{36}{64}} = -\dfrac{2\sqrt7}{8}\\\\\tan \theta = \dfrac{\sin \theta}{\cos \theta} = -\dfrac{2\sqrt7}{6}\\\\\csc \theta = \dfrac{1}{\sin \theta} = -\dfrac{8}{2\sqrt7}

Evaluate the following:

a)

\tan \theta\times \cot \theta =\tan \theta\times\dfrac{1}{\tan \theta} = 1

b)

\csc \theta\times \tan \theta\\\\= -\dfrac{8}{2\sqrt7}\times -\dfrac{2\sqrt7}{6} = \dfrac{4}{3}

c)

\sin^2 \theta + \cos^2 \theta = 1\\\text{using the trignometric identity}

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