Math, asked by vanshikakatria, 4 months ago

The value of cos [(n + 1)A] cos[(n + 2)A] + sin [(n + 1)A] sin[(n+2)A] is

(a) cos A (b) cos A (c) sin A (d) sin A

Answers

Answered by sinchanaspatil0886

2

Answer:

C} option will be the answer to your question

Step-by-step explanation:

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