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cos²xcot²x = cot²x - cos²x (cot²x = cos²x/sen²x)
cos²xcos²s/sen²x = cot²x - cos²x (cos²x = 1 - sen²x) Por identidad
fundamental
[Cos²x( 1 - sen²x)]/ senx = cot²x - cos²x
(cos²x - sen²xcos²x) / senx = cot²x - cos²x
cos²x/sen²x - (sen²xcos²x)/sen²x = cot²x - cos²x
cot²x - cos²x = cot²x - cos²x