Evaluate. cos 2a if 2 cos 3α = cos a

Q: Which of the following is equivalent to 2 cos(3x) cos(5x)? Select an answer and submit. For keyboard…

A: We have the formula,  Cos(A+B) + Cos(A-B) = 2 CosA CosB------(1) Now given that, 2Cos(3x) Cos(5x)…

Q: Simplify. 4 cos a - 4 COS 2π +α 4 • COS 2π +α 2

A: See the attachment.Explanation:

Q: tan 12 +tan 12 cos 24 +cos 24 +csc' 30

A:

Q: If secα= 11/ 3​, then what is cosα

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Q: 3 – 5 (cos (a) + cos²(ß)

A: Given: 3-5cos2α+cos2β

Q: Compute without using a calculator.

A: Explanation: We know that,  cosx=sinπ2-x Now  cos3π2=sinπ2-3π2              =sin(-π)…

Q: Evaluate. cos 2a if sin 3α = 2 sin a α

A: Final answer and explanation are clearly mentioned in the next section.Explanation:Please let me…

Q: Find cos o. (8, 6) ? COS O ニ Give your answer in lowest terms.

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Q: 7 Tt 2a) Find cos 6.

A: