Mathematics: Need help with Question seven, on the topic of trigonometric functions.

Need help with Question seven, on the topic of - id5248464, hdjsjfjruejchhehd

Ответ:

ragadbat

19.01.2022

$\cos \: 2 \theta = \frac{1}{2} \\ \\ \therefore \: \cos \: 2 \theta = \cos \: 60 \degree \\ \therefore \: \cos \: 2 \theta = \cos \: (180 \degree - 120\degree ) \\ ( \because \: \theta \: lies \: between \: - 90 \degree \: and \: 90 \degree)\\ \therefore \: \cos \: 2 \theta = - \cos \: 120 \degree \\ \therefore \: 2 \theta = - 120 \degree \\ \therefore \: \theta = \frac{ - 120 \degree}{2} \\ \huge \red{\therefore \: \theta}\pink {= } \orange{ - 60 \degree}$

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Ответ:

rhettperkins

30.06.2020

Mathematics

He wrote 40,000 words during the remaining part of the semester

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Need help with Question seven, on the topic of trigonometric functions.

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