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

Concept: Factorization Formulae - Formulae for Conversion of Product in to Sum Or Difference
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Chapter 3: Trigonometry - 2 - Exercise 3.4 [Page 51]
Q 1. (iii)
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Balbharati Mathematics and Statistics 1 (Arts and Science) 11th Standard Maharashtra State Board
Chapter 3 Trigonometry - 2
Exercise 3.4 | Q 1. (iii) | Page 51
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