Question

помогите 
вычислите 
sin 11π/24 sin 5π/24

Answer 1

= (cos (11π/24-5π/24)- cos (11π/24+5π/24))/2=(cos π/4 - cos 2π/3)/2= (√2/2+1/2)/2=(√2+1)/4

Answer 2

Даешь лучший!

Answer 3

thank you