Cos2x 1 2cosx sin 2x 0

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  b) cos2x ( 1 sin2x M1. sin2x sin x 1=0 M1 A1. sin x = M1. sinx = -1.618.. or 0.618.. A1 cao-1.618… gives no solutions. x = 0.666 or 2.48 A2 [7] 6. a) i) cos2x ( 1 sin2x B1. 3sin x + 2cos2x ( 3s + 2(1 s2) M1 ( 2 + 3s 2s2 A1 ( (2 s)(1…

  2cos2x 4 cos x 12

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  Phương trình LG biến đổi về tích bằng 0 . 1/ cos2x- cos8x+ cos4x=1 2/sinx+2cosx+cos2x-2sinxcosx=0. 3/sin2x-cos2x=3sinx+cosx-2 4/sin3 x+2cosx-2+sin2 x=0. 5/ 3sinx+2cosx=2+3tanx 6/ sin2x+cos2x+cosx=0 . 7/ 2sin2x-cos2x=7sinx+2cosx …

  2cos 2x 5 sin x 1 0

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  Mar 31, 2010 · (a) sinx + 2cosx = 0 (b) sin2x = cos3x (c) cos2x + 3sinx = 3 (d) 2sinx + cosx = 1 (Hint: sin2x + cos2x ( 1) 11. Let x = 54o. (a) Prove that cos2x + sin3x = 0 (b) Prove that sin3A = 3sinA ( 4sin3A (where A is any real number). (c) Prove that sin54o is a root of 4y3 + 2y2 ( 3y ( 1 = 0 …

  x 3sinx 1 0

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• [DOC File]A Level Mathematics Questionbanks

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  sinx (2cosx 1) = 0 M1 A1. sinx = 0 or cosx = x = 0, 180, 60, 300 A3 (-1 eeoo) [6] b) From (a), have 2x = 0, 180, 60, 300 M1. x = 0, 90, 30, 150 A2 ft [3] 2. a) cos2x + sin2x ( 1 ( cosA =, cosB = M1 A1. sin(A+B) ( …

  2cos 2x 2cosx cos2x 1 sinx

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  Bài 1. Giải phương trình: cos2x+cos22x+cos23x=1 (1) Lời giải (1)(2cos2x+2cos22x+2cos23x=2(1+cos2x+2cos22x+1+cos6x=2 ((cos6x+cos2x)+2cos22x=0…

  cos2x sin2x 2cosx 1 0

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