Question

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

Answer 1

Nu sunt sigur !

$cosx* \frac{cosx}{sinx} - \frac{cosx}{sinx} - \frac{sin^2x}{sinx} = 0$

$\frac{cos^2x-cosx-sin^2x}{sinx} =0$

$\frac{cos2x-cosx}{sinx} = 0$

$\frac{cosx}{sinx} =0$

$ctg=0$