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1 +cosy seny
seny 1 -cosy 1-cosy multiplico y divido por ( 1 -cosy)
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1 +cosy 1 -cosy seny
seny (1-cosy) 1-cosy como sen^2y = 1-cos^2y
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1-cos^2y seny
seny (1-cosy) 1-cosy
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sen^2y seny
1-cosy 1-cosy
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seny seny