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what is trigonometric expansions?
Dear nithin
Representation of power of trignometric ratio in terms trignometric ratio of multiple angel is known as trignometric expansions
for example.
cos6q = 1/32{cos 6q+6cos 4q+15cos 2q+10 }
or
cos7q = 1/64{cos 7q+7cos 5q+21cos 3q+35cos q }
these expantion can bederived by puting cosx =(eix+e-ix)/2
and expand it with the hepl of binomial .
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