Question

√2sin 13П/8*cos 13П/8 помогите пожалуйста

Answer 1

sgrt 2 * sin 13pi/8 * co s13pi/8 = 
= sgrt 2 / 2 * (2 sin 13pi/8 * cos 13pi/8) = = sgrt2/2 * sin(13pi/4) =
= sgrt2/2 * sin( 2 pi + 3 pi/4) = sgrt2/2 * sin 3pi/4=
sgrt2/2 * sgrt2/2= 2/4 = 0,5