Maharashtra State BoardHSC Science (Electronics) 11th
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Express the following as a sum or difference of two trigonometric function: 2 cos 4θ cos 2θ - Mathematics and Statistics

Sum

Express the following as a sum or difference of two trigonometric function:

2 cos 4θ cos 2θ

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Solution

2 cos 4θ cos 2θ

= cos ( 4θ + 2θ) + cos ( 4θ – 2θ)

= cos  6θ + cos 2θ

  Is there an error in this question or solution?
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