1/senx - senx = (cosx/senx)cosx
(1+sen^2x)/senx = cos^2x/senx
1+sen^2x = cos^2x
cos^2x - sex^2x = 1
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1/senx - senx = (cosx/senx)cosx
(1+sen^2x)/senx = cos^2x/senx
1+sen^2x = cos^2x
cos^2x - sex^2x = 1