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Dear tejas ramkumar,
cos(7x) = 64 cos7(x) - 112 cos5(x) + 56 cos3(x) - 7 cos(x)
Thank You !!
Please approve my answer if you liked it by clicking on "Yes" below..!!!
convert cos(7x) in cos (3x+4x)
then expand it and after that use cos(3x) formulae and again write cos(4x) as cos(2x+2x) and expand it then use cos(2x) formulae and you will get answer....
thanx
atleast aprove my answer yaar
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