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Rezolvati in R ecuatia cosx*cotx-ctgx-sinx=0 .

Răspuns :

Nu sunt sigur !

[tex]cosx* \frac{cosx}{sinx} - \frac{cosx}{sinx} - \frac{sin^2x}{sinx} = 0 [/tex]

[tex] \frac{cos^2x-cosx-sin^2x}{sinx} =0 [/tex]

[tex] \frac{cos2x-cosx}{sinx} = 0 [/tex]

[tex] \frac{cosx}{sinx} =0 [/tex]

[tex]ctg=0[/tex]