Question

5√2sin 7π/8 cos 7π/8
помогите решить плиз

Answer 1

$5 sqrt{2} sin(7 pi /8)cos(7 pi /8) = frac{5sqrt{2}}{2} sin(7 pi /4)=frac{5sqrt{2}}{2}sin( pi /4)=frac{5sqrt{2}}{2}*frac{sqrt{2}}{2}=$ 2,5