prove that cos1cos2cos3........cos180=0
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cos1cos2cos3....cos90....cos180= cos1cos2....0...cos180=0
cos 90 = 0
cos 90 = 0
adithyan101:
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Cos1..... Cos180 =0
Cos........cos 90..... Cos 180 =0
Cos 1×.......×0×..........cos180 =0. {0×n=0}
0=0
Lhs = rhs
It is proved
Cos........cos 90..... Cos 180 =0
Cos 1×.......×0×..........cos180 =0. {0×n=0}
0=0
Lhs = rhs
It is proved
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