Prove that cos alpha + cos 3 alpha + cos 5 alpha + cos 7 alpha + cos 9

1.	Prove that cos alpha + cos 3 alpha + cos 5 alpha + cos 7 alpha + cos 9 alpha = sin 10 alpha / 2 sin alpha
Answer» ANSWER: it is very BIG problem to do it once try it in your ROUGH not it is very U can do it

Prove that cos alpha + cos 3 alpha + cos 5 alpha + cos 7 alpha + cos 9 alpha = sin 10 alpha / 2 sin alpha

Answer»

ANSWER:

it is very BIG problem to do it once try it in your ROUGH not it is very U can do it

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Prove that cos alpha + cos 3 alpha + cos 5 alpha + cos 7 alpha + cos 9 alpha = sin 10 alpha / 2 sin alpha

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