Question

cos^2 a/2,если cos a =0.6

Answer 1

$co s^{2} \frac{ \alpha }{2} = \frac{1+cos(2* \frac{ \alpha }{2}) }{2} = \frac{1+cos \alpha }{2} = \frac{1+0.6}{2} = \frac{1.6}{2} =0.8$