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Mathematics
Emeline
4 June, 22:39
Sinx/1+cosx = cscx-cotx prove ls=rs
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Peter Little
5 June, 01:03
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L S = sin x / (1 + cos x) * (1 - cos x) / (1 - cos x) =
= sin x (1 - cos x) / (1 - cos² x) =
= (sin x - sin x cos x) / sin² x =
= sin x / sin² x - (sin x cos x) / sin² x =
= 1 / sin x - cos x / sin x = csc x - cot x = RS
Therefore: LS = RS
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