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Question
Express the following as a sum or difference of two trigonometric function:
`2sin (2pi)/3 cos pi/2`
Sum
Solution
`2sin (2pi)/3 cos pi/2`
= `sin((2pi)/3 + pi/2) + sin((2pi)/3 - pi/2)`
= `sin (7pi)/6 + sin pi/6`
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Factorization Formulae - Formulae for Conversion of Sum Or Difference into Product
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Chapter 3: Trigonometry - 2 - Exercise 3.4 [Page 51]
