30 БАЛЛОВ ДАЮ ПОМОГИТЕ

Question

30 БАЛЛОВ ДАЮ ПОМОГИТЕ

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Answer 1

№14
=3π/4 - π/4 = 2π/4 = π/2
№15
=5π/6 + π/6 = π
№16
=2π/3 - π/6 = 3π/6 = π/2
№17
=5π/6 -π/3 = 3π/6 = π/2