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cscx - sen x = cosxcotx (cscx = 1/senx)
1/senx - senx = cosxcotx
(1 - sen²x)/senx = cosxcotx (Por identidad fundamental
1 - sen²x =cos²x reemplazas)
cos²x/senx = cosxcotx
cosx . cosx/senx = cosxcotx (cosx/senx = cotx reemplazas)
cosx.cotx = cosx.cotx