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Prove that Sin (N + 1)X Sin (N + 2)X + Cos (N + 1)X Cos (N + 2)X = Cos X - CBSE (Arts) Class 11 - Mathematics

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Question

Prove that sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n + 2)x = cos x

Solution

L.H.S. = sin (n + 1)x sin(n + 2)x + cos (n + 1)x cos(+ 2)x

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APPEARS IN

 NCERT Solution for Mathematics Textbook for Class 11 (2018 to Current)
Chapter 3: Trigonometric Functions
Q: 10 | Page no. 73

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Solution Prove that Sin (N + 1)X Sin (N + 2)X + Cos (N + 1)X Cos (N + 2)X = Cos X Concept: Trigonometric Functions of Sum and Difference of Two Angles.
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