Sprawdź tożsamość [latex] frac{ sin^{2} alpha }{1+ cos^ alpha} + frac{sin alpha +sin alpha x cos alpha }{sin alpha } =2[/latex]

[latex] frac{ sin^{2} alpha }{1+ cosalpha} + frac{sin alpha +sin alpha x cos alpha }{sin alpha } =2\ L=frac{1-cos^2alpha}{1+cosalpha}+frac{sinalpha(1+cosalpha)}{sinalpha}\ L=frac{(1-cosalpha)(1+cosalpha)}{1+cosalpha}+1+cosalpha\ L=1-cosalpha+1+cosalpha\ L=2 \ P=2\ \ L=P [/latex]