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

Toán Lớp 9: khi `cos`$\alpha$`=2/3` thì `sin`$\alpha$`=?`

Toán Lớp 9: khi cos$\alpha$=2/3 thì sin$\alpha$=?

Comments ( 1 )

  1. Ta có : sin^{2}α + cos^{2}α = 1
    => sin^2α =  1 – cos^2α
    => sin^2α = 1- \(frac{2}{3})^{2}
    => sin^2α = \frac{5}{9}
    => sinα = \frac{\sqrt[5]}{3}

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

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