arcsin(π/6)=
    arcsinπ/6=
    sin[2(arcsinπ/4)]=
    sin2(arcsinπ/4)=
    sin2(arcsin1)=
    sin22．5
    6*√12
    6*√12
    2*√12
    6*2√3
    2-1=
    e(-3. 8)
    9×0.055470×0.055470-sin0.055470-1
    24.3*9.8/sin35.7
    60*（1000*3/667-3）-0.3*60*1000*3/1334
    60*0.3333*3-(0.3*60*((0.3333*3+3)/2))
    60*0.3333*3-0.3*60*((0.3333*3+3)/2)
    60*0.3333*3-0.3*60*(0.3333*3+3-(0.3333*3+3)/2)
    log(3,27)=
    30*0.3333*3-0.3*30*(0.3333*3+3-(0.3333*3+3)/2)

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