Use tan ⁡x=2, where 180° < x < 270°, to answer the following questions. Part A: What formulas(s) can be used to find cos⁡(2x)? Part B: What is cos⁡(2x)?

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asked Dec 20, 2020 51.3k views

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Use tan ⁡x=2, where 180° < x < 270°, to answer the following questions.

Part A: What formulas(s) can be used to find cos⁡(2x)?

Part B: What is cos⁡(2x)?

Mathematics
middle-school

Daniel Albuschat asked

by Daniel Albuschat

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Answer:

A: 2cos2x−1

A: 1−2sin2x

A: cos2x−sin2x

B: 0

Explanation:

Lxgr answered Dec 22, 2020

by Lxgr

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Answer:

A = 3/5

B = 3/5

Explanation:

Drott answered Dec 24, 2020

by Drott

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