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The number of solutions of equation is equal to:
(A) (B) (C) (D)

Vikram , 5 Years ago
Grade 11
anser 1 Answers
Arun

Last Activity: 5 Years ago

Dear student
 
On simplicity
 
We get
LHS
 
Cos theta + cos 3 theta +.....cos 17 theta
 
Sin (9 theta)* cos 9theta/sin theta
 
 = Sin18 theta/2sin tgeta = ½
 
Sinn18 theta = sin theta
 
18 theta = nπ + (-1)ⁿ theta
 
Now make case for n off and even
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