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

Toán Lớp 11: Rút gọn B = 2sin2x – 1/ sin2x – sinx × cosx

Home/ Toán Lớp 11: Rút gọn B = 2sin2x – 1/ sin2x – sinx × cosx

Toán Lớp 11: Rút gọn B = 2sin2x – 1/ sin2x – sinx × cosx

Tháng Hai 11, 2023 Toán học 1 Comment 0 views

Toán Lớp 11: Rút gọn B = 2sin2x – 1/ sin2x – sinx × cosx

Comments ( 1 )

  1. minhhaanh
    minhhaanh
    11 Tháng Hai, 2023 at 6:18 sáng
    Reply
    $B=\dfrac{2\sin2x-1}{2\sin x\cos x-\sin x\cos x}$
    $=\dfrac{2.2\sin x\cos x-1}{\sin x\cos x}$
    $=4-\dfrac{1}{\sin x\cos x}$
    $=4-\dfrac{\sin^2x+\cos^2x}{\sin x\cos x}$
    $=4-\dfrac{\sin^2x}{\sin x\cos x}-\dfrac{\cos^2x}{\sin x\cos x}$
    $=4-\tan x-\cot x$

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

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