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L=(cosx/sinx - sinx/cosx)/(sinx+cosx)=
[(cos²x - sin²x)/(sinx*cosx) ]/(sinx+cosx)=
[(cosx - sinx)(sinx+cosx)(/(sinx*cosx) ]/(sinx+cosx)=
(cosx - sinx)(/(sinx*cosx) =cosx/(sinx*cosx) - sinx/(sinx*cosx) =
1/sinx - 1/cosx=P
tego drugiego nie wiem