Math, asked by burnitdown52, 5 months ago

5.
cos (n + 1) a cos (n-1) a + sin (n + 1)a sin (n-1) a =
a) con2na
b) sin2na
c) cos2 a
d) sin2 a

Answers

Answered by pc955392

3

Answer:

option D is the correct answer for your question

Step-by-step explanation:

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