Math, asked by anirbanrc9460, 1 year ago

Simplify, cosx + cos3x + cos5x +...+ cos19x (10 terms)

Answers

Answered by yogedoo

0

Answer:

sum of 10 terms= 10/2(cosx+cos19x) {sn=n/2(a+an)}

=5(cos20x)

= cos100x

Step-by-step explanation:

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