if tanA=ntanX sinA=msinX then prove that cos^2A=(m^2-1)/(n^2-1)

8,303 results
  1. maths

    ifm sin B=nsin(2A+B) prove that(m+n)tanA=(m-n)tan(A+B)

  2. maths

    Prove SinA/1-CosA = CosecA + CotA

  3. maths

    Prove that [1+cotA-CosecA] [1+tanA+secA] = 2

  4. Trigonometry

    If sinA + sinB = a and cosA + cosB = b, find the value of tanA-B/2

  5. trig

    If point (3, -8) lies on the terminal side of an angle A in standard position, find: a) sinA b) tanA

  6. Amaths

    prove sin(A+B)/sin(A-B)=(tanA+tanB)/(tanA-tanB)

  7. Trigonometry

    Prove that 1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B) = tanA/2cotA/2

  8. Maths

    Prove sqrt(Sec^2 A+Cosec^2 A)=TanA+CotA

  9. Math

    prove that sinA/(1+cosA) + (1+cosA)/(sinA) = 2cosecA

  10. math

    if cos(B-C)+cos(C-A)+cos(A-B)=-3/2 then prove that cosA+cosB+cosC=O and sinA+sinB+sinC=O after that prove that cos(B-C)=cos(C-A)=cos(A-B)=-1/2

  11. trignometry

    prove: sin(a+b)/cosacosb=tana+tanb

  12. maths

    if sinA+cosA=1/5, then a value of tanA/2 satisfies which of the equation? a. 2x^2-x-1 b.x^2-2x-3=0 c.2x^2-5x-3=0 d. 2x^3-7x^2+2x+3=0

  13. Maths

    Cos^2A/sinA-cosecA+sinA=0 Prove lHS =RHS

  14. trigonometry

    Prove : 1 + Sin2A/ Cos2A = CosA + SinA / CosA- SinA

  15. trig help

    verify that cos(A-B)/cosAsinB=tanA+cotB is an identity

  16. maths(trigonometry)

    prove that sinA-cosA+1/sinA+cosA-1=1/secA-tanA

  17. further mathematics

    Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) show that PQ=(cosA(A-B) sin(A B)) (sinA(A B) cos(A-B))

  18. maths Pls help trig

    1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA-2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[-360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0

  19. Maths

    If tan inverse(x^2-y^2/x^2+y^2)=a then prove that dy/dx=x/y (1-tana/1+tana).

  20. Math

    Hello I am having trouble with proving this: sinA/secA+secA/cscA = tan(A)(2-sin^2(A)) So far I've gotten SinA/(1/cosA) + (1/cosA)/(1/sinA) SinACosA + sinA/cosA I am stuck here, not even sure if multiplying by the reciprocal was the right step..

  21. maths (trigonometry)

    please solve these if possible Q1. If sinx +siny=3(cosy-cosx) then the value of sin3x/sin3y. Q2. If sina ,cosa,and tan a are in g.p.then cos cubea+cos square a is equal to

  22. math

    find all solutions in the interval [0,2 pi) sin(x+(3.14/3) + sin(x- 3.14/3) =1 sin^4 x cos^2 x Since sin (a+b) = sina cosb + cosb sina and sin (a-b) = sina cosb - cosb sina, the first problem can be written 2 sin x cos (pi/3)= sin x The solution to sin x =

  23. Trig

    Draw a picture and show all work. Given sinA=4/5 and cosA

  24. math (trig)

    i have some problems doing trig the first one is: Show that cos(x/2) sin(3x/2) = ½(sinx + sin2x) i know that you are supposed to substitute all those trig function things in it but i kind of forgot how to the only that i can see substituting in is the

  25. trig

    I need to prove equality. a) (sina + cosa)^2 -1 / ctga - sinacosa = 2tg^2a b) (sin^2x/sinx-cosx) - (sinx+cosx/tg^2x+1) = sinx + cosx c) sin^4a - sin^2a - cos^4a + cos^2a = cosπ/2 How to do these?

  26. algebra

    i have a problem in dis sum from complex numbers prove that (1+sinA+icosA)/(1-sinA-icosA)=i(secA+tanA)

  27. trigonometry

    x×sin^3A=y , cos^3A = sinA × cosA , x×sinA= y×cosA , then prove that x^2+ y^2= 1 I have no idea

  28. Trigonometry

    Prove that sin(n+1)A-sin(n-1)A/cos(n+1)A+2cosnA+cos(n-1)A = tanA/2

  29. Geometry

    In a right triangle if sinA=6/7 and cosA=4/7 what is tanA=

  30. 11

    SinA + sinB/sinA - sinB= tanA+B/2cotA-B/2

  31. Trigonometry

    IfA=340°, prove that 2sinA/2 = -(v1+sinA) + (v1-sinA)

  32. Maths

    Prove that [sinA/(1-cosA)-(1-cosA)/sinA]*[cosA/(1+sinA)+(1+sinA)/cosA]=4cosecA I the second part as 2 secA

  33. math

    how do you solve this.prove: cos2A plus cosA divided by sin2A minus sinA equal to cos2A plus 1 divided by sinA

  34. trigonometry

    if secA-tanA =10 than sinA =?,cosA =?,secA =?

  35. trigonometry help me

    6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin y 10.Prove that 1+tanθ/1-tanθ = sec^2θ+2tanθ/1-tan^2θ 17.Prove that sin^2w-cos^2w/tan w sin w + cos w tan w = cos w-cot w cos w 23.Find a counterexample to shows that the equation sec a – cos

  36. trignonmetry

    6. Prove that tan λ cos^2 λ + sin^2λ/sin λ = cos λ + sin λ 10. Prove that 1+tanθ/1-tanθ = sec^2θ+2tanθ/1-tan^2θ 17.Prove that sin^2w-cos^2w/tan w sin w + cos w tan w = cos w-cot w cos w 23. Find a counterexample to shows that the equation sec

  37. Maths

    How do I do this Need details solution to follow up prove that cos(a)+cos(a+b)+cos(a+2b)+....+cos(a+(n-1)b)={cos(a+((n-1)/2)bsin(nB/2)}/½sinb for all N£N

  38. Trigonometric Identities

    Verify/prove that: (cotA+cotB)/(tanA+tanB)+(1-cotAcotB)/(1-tanAtanB) = 0

  39. math

    prove that 1-tan 4 A by1+tan 4 A =cosA + sinA by cosA - sinA

  40. Mathematics - Trigonometric Identities

    Let y represent theta Prove: 1 + 1/tan^2y = 1/sin^2y My Answer: LS: = 1 + 1/tan^2y = (sin^2y + cos^2y) + 1 /(sin^2y/cos^2y) = (sin^2y + cos^2y) + 1 x (cos^2y/sin^2y) = (sin^2y + cos^2y) + (sin^2y + cos^2y) (cos^2y/sin^2y) = (sin^2y + cos^2y) + (sin^2y +

  41. mathematics trignometry

    if tanA=ntanX sinA=msinX then prove that cos^2A=(m^2-1)/(n^2-1)

  42. Trigonometric Identities

    Verify/prove the following: (sinA+tanA)/(1+secA) = sinA ______________________________ tanu = 1+sinu-cos^2u/cosu(1+sinu) __________________________________ cotu = (2+cscu/secu)-2cosu ______________________________ tanAsinA/tanA+sinA = tanA-sinA/tanAsinA

  43. Trig

    Please help with this one. I've worked it out in so many ways and can't tell what's correct. sinA sinA ----- - ------ 1+sinA 1-sinA Which answer is correct for the problem above? a) 1+cotA b) sinA tanA c) -2tan^2A d) secA cscA common denominator: 1-sin^2 A

  44. Maths

    Prove: 1+(TanA/SinB)^2/1+(TanA/SinC)^2 = 1+(SinA/TanB)^2/1+(SinA/TanC)^2

  45. MathS triG

    1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA-2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[-360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0

  46. Maths

    Hi, can someone give me the answer to this question: secA-tanA=1/4. Find cosA I got: CosA=4(1-sinA) Is my answer good? Now multply each side by (1+sinA) CosA(1+sinA)=4 cos^2 A CosA=1/4 (1+sinA) 16(1-sinA)=1+sinA 15=17SinA So you have sinA, now find Cos A

  47. Trig

    prove that tanA divided by the sinA equals the secA

  48. Trigonometric Identities

    Verify/prove that: sinAcosA/1-cosA = sin^2/tanA-sinA

  49. math

    12. IF 1/SinA+1/CosA=1/SinB+1/CosB ,PROVE THAT: Cot{(A+B)/2}=TanA.TanB

  50. Math

    If 1/sinA+1/cosA =1/sinB+1/cosB, prove that: cot(A/2+B/2) = TanA. TanB

  51. math

    if tanA=root2-1, prove that (secA.sinA tan squareA-cosecA) =(12-¡Ì5)/2

  52. Math2

    IF (1/SinA)+(1/cosA)= (1/sinB)+(1/cosB) Prove that cot((A+B)/2)=tanA tanB Please helppppppppppp

  53. Trigonomentry plz help

    tanA=ntanB sinA=msinB find cos^2A in terms of 'm' and 'n' plz help

  54. dr.khastagir govt girls high school

    tanA+sinA=p, tanA-sinA=q shows that p^2+q^2

  55. trig

    if 5cos A plus 3=0 and 180

  56. mathematics trignometry

    if sina, cosa, tana are in geometric progression then prove that cot^6a-cot^2a=1

  57. trig

    if sina,cosa,tana are in geometric progression then prove that cot^6a-cot^2a=1

  58. mathematics trignometry

    prove that the following are identity 1. (cotA+cosecA-1)/(cotA-cosecA+1)=cosecA+cotA 2. (sinA-cosA+1)/(sinA+cosA-1)= 1/(secA-tanA)

  59. trig

    Establish the following identity: CosA/1-TanA + SinA/1-CotA = CosA-SinA

  60. maths trigo

    prove that sin(n+1)A-sin(n-1)A/cos(n+1)A+2cos(nA)+cos(n-1)A=tanA/2

  61. Math

    In any angle ABC prove that the perimeter = a/Sin A(Sin A + Sin B + Sin C) Start with perimeter = a+b+c but b= aSinB/sinA and c= aSinC/SinA and if you don't remember, a=a=a*SinA/ SinA

  62. math

    Determine exact value of cos(cos^-1(19 pi)). is this the cos (a+b)= cos a cos b- sina sin b? or is it something different. When plugging it in the calculator, do we enter it with cos and then the (cos^-1(19 pi)).

  63. trigonometry

    If sinA+tanA=p then sin2A?

  64. math

    (secA+tanA)(1-sinA)

  65. Pre-Calculus

    How can the following two identities be verified? 1. (cos^2y)/(1-siny)=1+siny 2. sin^2a-sin^4a=cos^2a-cos^4a Thanks! change cos^2a to 1-sin^2a=(1-sina)(1+sina) Thank you. I figured out the first one with your help, but I'm still stuck on the second. Any

  66. trig

    determine wheather each of the following is an identity or not prove it 1. cos^2a+sec^2a=2+sina 2. cot^2a+cosa=sin^2a

  67. Math

    If sinA+sinB=1/2 and cosA+cosB=1/2 then the value of tanA+tanB

  68. Maths

    TanA=√2-1 then find secA.sinA+tan^2A-cosecA

  69. Trig

    IfA=340°, prove that 2cosA/2 = -(v1+sinA) - (v1-sinA)

  70. Trig

    Draw a picture and show all work. Given cosA=3/10 and tanA

  71. trig

    express the trig. ratios sinA,secA n tanA in terms of cotA.

  72. physics

    the velocity ratio of an inclined plane whose angle is a I a). VR=1/sinA b). VR=1/tanA c). VR=1/cosA d). VR=1/cotA?

  73. trig

    Prove that sin(A+B+C+)cos(B+C)-cos(A+B+C)sin(B+C)=sinA

  74. TRIG!

    Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6 x=1 - (3/4)sin^2 2x work on one side only! Responses Trig please help! - Reiny, Monday, February 23, 2009 at 4:27pm LS looks like the sum of cubes sin^6 x + cos^6 x = (sin^2x)^3 +

  75. Math

    CosA/1+sinA=1-sinA/cosA I have to prove the identity each side has to b the same how would i do that? I have a unit test on monday so im doing practice questions

  76. MATH

    Hi, I really need help with these questions. I did some of them halfway, but then I got stuck. Would you please help me? Thank you so much. Prove the identity.... 1. sec x + tan x(1-sin x/cos x)=1 1/cos x + sin x/cos x(cos^2 x/cos x)=1 1+sin x/cos

  77. Math

    Prove the identity: tanA/secA+1 = secA-1/tanA Can u please explainit to me step by step? I greatly appreciate your help! Thanks:)

  78. Trigonometry desperate help, clueless girl here

    2. solve cos 2x-3sin x cos 2x=0 for the principal values to two decimal places. 3. solve tan^2 + tan x-1= 0 for the principal values to two decimal places. 4. Prove that tan^2(x) -1 + cos^2(x) = tan^2(x) sin^2 (x). 5.Prove that tan(x) sin(x) + cos(x)=

  79. Trigonometry

    1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two decimal places. 6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin y 10.Prove that 1+tanθ/1-tanθ = sec^2θ+2tanθ/1-tan^2θ 17.Prove that sin^2w-cos^2w/tan w sin w + cos w tan w =

  80. Trig

    I don't know the physics behind Snell's Law, but I can do the math Snell's Law says sin(angle of incidence)/sin(angle of reflection) = refractive index since you know the two angles... sin45/sin27 = refractive index =1.5575365 so for an angle of refection

  81. trig

    prove that :cosA-sinA+1/cosA+sinA-1=cosecA+cotA

  82. trig help much appreciated! :))

    1. Find the complete exact solution of sin x = . 2. Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. 3. Solve tan2 x + tan x – 1 = 0 for the principal value(s) to two decimal places. 4. Prove that tan2  – 1 + cos2 

  83. advanced functions

    Prove that 2sinxsiny = cos(x-y) - cos(x+y) Prove that sin2x + sin2y = 2sin(x+y)cos(x-y)

  84. trigo math

    7. Prove that tan B sin B + cos B = sec B. 11. Prove that tanλ cos^2λ +sin^2λ/sinλ = cos λ + sin λ. 12. Prove that 1+tanθ/1+tanθ = sec^2θ+2tanθ/ 1-tan^2θ. 21. Prove that sin^2w-cos^2w/ tan w sin w + cos w tan w = cos w – cot w cos w.

  85. Maths:Trigonometry

    How do I do this Need details solution to follow up prove that cos(a)+cos(a+b)+cos(a+2b)+....+cos(a+(n-1)b)={cos(a+((n-1)/2)bsin(nB/2)}/½sinb for all N£N ???

  86. Amaths

    prove tanA+tanB=sin(A+B)/cosAcosB

  87. Tc Maths

    Prove: TanA+2Tan2A+4Tan4A+8Cot8A=CotA

  88. math urgent

    Prove: TanA+2Tan2A+4Tan4A+8Cot8A=CotA

  89. math

    Prove: tanA+2tan2A+4tan4A+8cot8A=cotA

  90. Math- Trig

    1. Determine the exact value of cos^-1 (pi/2). Give number and explanaton. 2. Determine the exact value of tan^-1(sq. root 3). with explanation. 3. Determine exact value of cos(cos^-1(19 pi)). with explanation. 4. Determine the exact value of sin(sin^-1(20

  91. Algebra II/ Trig

    Should the triangle be solved beginning with Laws of Sines or Laws of Cosines. Then solve the triangle and round to the nearest tenth. a=16, b=13, c=10 I got this answer but it is wrong and don't understand where I made the mistake. a=16, b=13, c=10

  92. Trig

    verify the following identity: cos(A-B)/cosAsinB=tanA+cotB

  93. trig

    I need to count this: a) 1-tg^2a/1+ctg^2a, when sina =2/3 b) 1-tg^2a/1-ctg^2a, when cosa= -1/3 c) tga * cos^2a, when sina + cosa=5/7 d) tg^2a + 1/sina * 1/cosa + ctg^2a, when tga + ctga =5

  94. trig

    How to do this one? (sina/1-cosa) + (1-cosa/sina) = Also, wanted to ask if I did another one right: 1 - sin^2a + tg^2a * cos^2a = 1 - sin^2a + (sina/cosa)^2 * cos^2a = 1 - sin^2a + sin^2a = 1 ???

  95. Math trigonometry

    Prove sinA/1+cosA =tan1/2A

  96. algebra

    prove that cosA/1-sinA=2cosecA

  97. maths

    prove that secA(1-sinA)-2tanA=1

  98. trig

    Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA

  99. trig

    Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA

  100. math

    if A+B+C=180degrees, prove that 2sin(B+C)sinA=1-cos2A

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