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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 11: Giảibgiúp mình với sin(2x+π/5)=1

Toán Lớp 11: Giảibgiúp mình với sin(2x+π/5)=1

Comments ( 1 )

  1. sin(2x+pi/5)=1
    ⇔2x+pi/5=pi/2+k2pi
    ⇔2x=(3pi)/(10)+k2pi
    ⇔x=(3pi)/(20)+kpi(k∈Z)

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222-9+11+12:2*14+14 = ? ( )

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