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

Toán Lớp 11: Tìm min max y= ( 3sinx + 4cosx)^2 + 6sinx + 8cosx

Toán Lớp 11: Tìm min max y= ( 3sinx + 4cosx)^2 + 6sinx + 8cosx

Comments ( 2 )

  1. Y = ( 3SINX + 4COSX)”2 + 6SINX + 8 COSX
    Y = 3SINX – 4COSX
    = – 5 < T< 5
    TA CÓ : Y = T2 -2T = (T – 1)2 -1
    DO 5<T < 5
    = – 6 < T – 1 < 4
    = 0 <( T -1 ) 2 < 36
    = 1<(T – 1)2 -1 < 35
    = MIN Y=-1
    SUY RA YÊU CẦU BÀI TOÁN
    – 1 > 2M – 1 = M < 0

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

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