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1 year ago

If cos8x = 13/36 find the value of cos4x.

Mathematics

1 answer:

Elina [12.6K]1 year ago

3 0

The value of cos 4x from the given identity is 0.999

<h3>Trigonometry identity</h3>

Given the cosine identity

cos8x = 13/36

Determine the value of x

8x = arccos(13/36)
8x = 0.36111

x = 0.36111/8
x = 0.04514

Determine the value of cos4x

cos4x = cos4(0.04514)

cos4(0.04514) = 0.999

Hence the value of cos 4x from the given identity is 0.999

Learn more trig identity here; brainly.com/question/7331447

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3 years ago

If cos8x = 13/36 find the value of cos4x.​

If cos8x = 13/36 find the value of cos4x.