10sin5pi/4 cos7pi/4 ctg3pi/4 = 10sin(pi + pi/4) cos(2pi - pi/4)ctg(pi - pi/4) =
10*(-V2/2)*V2/2*(-1) = 5
10sin 5π/4 cos 7π/4 ctg 3π/4= - 10√2/2 · √2/2 · (-1 ) = 5
10sin5pi/4 cos7pi/4 ctg3pi/4 = 10sin(pi + pi/4) cos(2pi - pi/4)ctg(pi - pi/4) =
10*(-V2/2)*V2/2*(-1) = 5
10sin 5π/4 cos 7π/4 ctg 3π/4= - 10√2/2 · √2/2 · (-1 ) = 5