Question

Вычислите значение выражения log32(sin5П/8)+log32(sin6П/8)+log32(sin7П/8)

Answer 1

=$log_{32} (sin5pi/8*sin6pi/8*sin7pi/8)=[tex]log_{32} ( \frac{ \sqrt{2} }{2}* \frac{ \sqrt{2} }{4} )= log_{32}(1/4)=-2/5$=-0.4
sin6π/8=sin3π/4=sin(π-π/4)=sinπ/4=√2/2
sin5π/8×sin7π/8=1/2(cos2π/8+cos12π/8)=1/2(cosπ/4+cos3π/2)=1/2(√2/2+0)=√2/4
ответ: -0,4