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Solve
sin3x+sin5x+sin7x = 0
x = π/4, π/2,3π/4
x = π/3, 2π/3
x = π/3,π/12,5π/12
cos3x=cos5x
x = π/3, 5 π/3
x = π, 7π /24, 11π/24
x = π/6, π /2, 5π/6
sinx+sin3x=0
x= π/2, 2π/3, 4π/3
x= π, 7π/24, 11π/24
x= π/3, π/12, 5π/12
–sinx-sin3x = 0
x = π/2, 2π/3,4π/3
x = π,7π/24 ,11π/24
x = π/3, π/12 ,5π/12
cos2x-cosx=0
x= π/2
x= 3π
x = π/3, 5π/3, π
sin2x+sinx = 0
x = π, 7π/24,11π/24
x = π/6, π/2,5π/6
cos3x+cos5x+cos7x=0
x = π/3, 2π/3,
x= π/4, π/2, π/8
sin3x+sin 5x = 0
sin sin x/2 = -1
x= π/4
–sin2x = cos3x
x = π, 2 π /3, 4 π/3
It is done.