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

Toán Lớp 11: Rút gọn $sinx-cosx$ ????????????????????????

Tháng Ba 12, 2022 Toán học 1 Comment 0 views

Toán Lớp 11: Rút gọn $sinx-cosx$
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Comments ( 1 )

  1. cattien
    cattien
    12 Tháng Ba, 2022 at 8:50 sáng
    Reply
    sinx – cos x = sqrt (2) . (sinx/sqrt(2)-cosx/sqrt(2)) $\\$
    <=>sinx – cos x = sqrt (2) . (sin( pi/4)sinx-cos(pi/4)cosx) $\\$
    <=>sinx – cosx – sqrt(2).sin(x-pi/4)
    Vậy sinx – cosx – sqrt(2).sin(x-pi/4)

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

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