3 years ago

Please help with this I will mark brainliest :)

Mathematics

1 answer:

bixtya [17]3 years ago

5 0

Answer:

Triangles

Step-by-step explanation:

Angle b
Triangle BED
Triangle ABC

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The particular identity you want to use is

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Then

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Expand the binomial to get

$3\cos^4x=\dfrac34\left(1+2\cos(2x)+\cos^2(2x)\right)$

Use the identity again to write

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and so

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