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Ratling [72]
3 years ago
11

(cos2a *cos 4a+ sin 2a*sin 4a)/sin4a

Mathematics
1 answer:
lyudmila [28]3 years ago
4 0

Answer:

Step-by-step explanation:

(cos 4a*cos 2a+sin 4a*sin 2a)/sin 4a

=[cos (4a-2a)]/sin 4a

=(cos 2a)/sin 4a

=(cos 2a) /(2 sin 2a cos 2a)

=1/(2 sin 2a)

=1/2 csc 2a

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The 1st choice is the correct one.

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Sveta_85 [38]

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5 0
4 years ago
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Answer:

\huge\boxed{\sf C.}

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