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

Toán Lớp 9: Q = sin ² α + cotg ² α . sin ² α

Toán Lớp 9: Q = sin ² α + cotg ² α . sin ² α

Comments ( 2 )

  1. $Q=sin^2\alpha+cot^2\alpha.sin^2\alpha$
    $Q=sin^2\alpha(1+cot^2\alpha)$
    $Q=sin^2\alpha.\dfrac{1}{sin^2\alpha}$
    $Q=1$

     

  2. Giải đáp : Q = 1
    Giải thích :
    Q = sin ² + cotg ² α . sin ² α
    Q = sin$^{2}$ $\alpha$ + ( cos $\alpha$ / sin $\alpha$ )$^{2}$ . sin$^{2}$ $\alpha$
    Q = sin$^{2}$ $\alpha$ + cos$^{2}$ $\alpha$ / sin$^{2}$ $\alpha$ . sin$^{2}$ $\alpha$
    Q = sin$^{2}$ $\alpha$ + cos$^{2}$ $\alpha$ 
    Q = 1

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

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