[tex]\\\frac{sin\alpha+cos\alpha}{cos\alpha}=1+tg\alpha \ /*cos\alpha \\sin\alpha+cos\alpha=cos\alpha+\frac{sin\alpha}{cos\alpha}*cos\alpha \\sin\alpha+cos\alpha=sin\alpha+cos\alpha \\L=P \\II \ sposob: \\L=\frac{sin\alpha}{cos\alpha}+\frac{cos\alpha}{cos\alpha}=tg\alpha+1 \\L=P[/tex]
