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cosx senx = senx cancelamos cosx ya que divide y multiplica a la vez
cosx
senx = senx
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seny coty = cosy
seny cosy = cosy cancelamos seny divide y multiplica a la vez
seny
cosy = cosy
...................................................
(1+tan²y) cos²y = 1
(sec²y ) cos²y = 1
1 cos²y = 1 cancelamos cos²y
cos²y
1 = 1