Cos2x sin2x 2cosx 1 0
[DOC File]A Level Mathematics Questionbanks
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a) Express cos2x (3sin2x in the form Rcos(2x+ ), where R >0 and 0o <
[DOC File]A Level Mathematics Questionbanks
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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
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16/cos2x-2cos3x+sinx=0 17/ tanx–sin2x-cos2x+2(2cosx-)=0 . 18/sin2x=1+cosx+cos2x 19/1+cot2x= 20/ 2tanx+cot2x=2sin2x+ 21/cosx(cos4x+2)+ cos2x-cos3x=0 . 22/ 1+tanx=sinx+cosx 23/ (1-tanx)(1+sin2x)=1+tanx . 24/ 2= 25/ 2tanx+cotx= 26/ cotx-tanx=cosx+sinx 27/ 9sinx+6cosx-3sin2x+cos2x=8 . Dang 8 : Ph¬ng tr×nh LG ph¶i thùc hiÖn c«ng thóc nh ...
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Feb 06, 2009 · F.4 Additional Mathematics Quiz (Trigonometry I) Name: _____ F.4___ ( ) 2009-02-06 Full. mark: 38. FORMULAE. 1. Let 5sin2x ( 12cos2x ( Rsin(2x ( () where R > 0 and ...
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16/cos2x-2cos3x+sinx=0 17/ tanx–sin2x-cos2x+2(2cosx-)=0 . 18/sin2x=1+cosx+cos2x 19/1+cot2x= 20/ 2tanx+cot2x=2sin2x+ 21/cosx(cos4x+2)+ cos2x-cos3x=0 . 22/ 1+tanx=sinx+cosx 23/ (1-tanx)(1+sin2x)=1+tanx . 24/ 2= 25/ 2tanx+cotx= 26/ cotx-tanx=cosx+sinx 27/ 9sinx+6cosx-3sin2x+cos2x=8 . DANG 8 : Phương trình LG phải thực hiện công thúc ...
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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 (d) Hence, or otherwise, express sin54o in surd form. 12 ...
[DOC File]集合与常用逻辑用语
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=cos2x-sin2x+sin2x=cos2x+sin2x. 又 ∴f(x)的值域为[-1，]. （2）假设则2cosx(cosx+sinx) =sinx(cosx-sinx), 即2cos2x+2sinxcosx=sinxcosx-sin2x, sin2x+sinxcosx+2cos2x=0, ①当cos2x=0时，sin2x=1,上式不成立； ②当cos2x≠0时，tan2x+tanx+2=0无解. 故假设不成立，向量与向量不平行. 举一反三：
[DOC File]Chuyên đề - LUYỆN THI CHẤT LƯỢNG CAO MÔN TOÁN
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Ta có (2) ( cos6x(2cos2x(1) = sin6x(1(2sin2x) ( cos2x(sin6x–cos6x) = 0 ( cos2x(sin2x–cos2x)(1+sin2x.cos2x) = 0 ( cos2x = 0 ( Ví dụ 3: Giải phương trình: (3). Giải. Ta có: Ph. ươ. ng pháp 2: Đ. ặt ẩn phụ . đư. a ph. ươ. ng trình l. ư. ợng …
[DOC File]CHUYÊN ĐỀ 1: LƯỢNG GIÁC
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5) cos2x + sin2x 2cosx + 1 = 0 6) sin3x + 2cos2x - 2 = 0 7) cos2x + cos22x + cos23x + cos24x = 8) 2 + cos2x + 5sinx = 0 9) 3(tanx + cotx) = 2(2 + sin2x) 10) 4cos3x + 3sin2x = 8cosx
[DOC File]TÀI LIỆU ÔN THI ĐẠI HỌC
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a. sinx + sin2x + sin3x = 0 b. cosx – 2cos2x + cos3x = 0 c. 4cos3xcosx – 2cos2x = d. 2sinxsin3x + sin=1 B. Phương trình lượng giác thường gặp
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