Упростите: [latex] \frac{cos \alpha }{cos \frac{ \alpha }{2} -sin \frac{ \alpha }{2} } [/latex]

(сos²(a/2)-sin²(a/2))/(cos(a/2)-sin(a/2))= =(cos(a/2)+sin(a/2))(cos(a/2)-sin(a/2))/(cos(a/2)-sin(a/2))= =(cos(a/2)+sin(a/2))