a) 3 sin x – 7 cos x = 0


б4 sin2x +
sinx cosx – cos2x = 1



в) 
sin 2x + sin2x = 1


г)  cos x = sin 3x


д)  sin 5x + sin 3x – sin 4x = 0

Пожалуйста, помогите!!!!! SOS!!!!
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