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

8,328 results
  1. maths

    Prove SinA/1-CosA = CosecA + CotA

  2. Pre-Calculus

    If sinA=3/5 when pi/2 < A < pi and cosB=5/13 when 3pi/2 < B < 2pi, find the exact value of the function cos(5pi/6+B).

  3. 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

  4. maths

    If sinA=1/2 then find cos^3A-3cosA.

  5. Math

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

  6. Pre-calculus (Trigonometry)

    The rotating spotlight from the Coast Guard ship can illuminate up to a distance of 250 m. An observer on the shore is 500 m from the ship. HIs line of sight to the ship makes an angle of 20 degrees with the shoreline. What length of shoreline is

  7. math (trigonometry)

    if tan A/2 =cosecA-sin A then prove cos^2 A/2=cos 36 degree

  8. maths

    sinA+cosA=p and secA+CosecA=q then show that q[p^2-1]=2p

  9. Maths, Divine International Public School

    If 15Cot=8, find (1+SinA)(1-SinA)/(1+CosA)(1-CosA)

  10. math

    Prove that sinA+sinB+sinC=-4cosA/2cosB/2cosC/2

  11. maths

    If cosA + sinA= root2 cosA Show that cosA - sinA= root2 sinA

  12. Maths

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

  13. 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))

  14. Trigonometry

    Prove that sin3A+sin2A-sinA = 4sinAcosA/2cos3A/2

  15. Maths

    Given that sinA=2/5 and that A is obtuse,find the value of cosA. 👍 0 👎 0 👁 25 asked by Raj yesterday at 4:18am sinA = 2/5, so cosA = √21/5 But A is in QII, so cosA = -√21/5 👍 0 👎 0 posted by oobleck yesterday at 6:51am Why not

  16. precalculus

    Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)

  17. 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..

  18. math

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

  19. Math

    A 5.0m ladder is leaning 3.1m up the wall. What is the angle the ladder makes with the ground? Would this be..... sinA=3.1/5.0 sinA=0.62 sin^-1=38degrees?

  20. 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

  21. Trig

    prove that tanA divided by the sinA equals the secA

  22. Maths

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

  23. trig

    if 5cos A plus 3=0 and 180

  24. maths

    If a cosA - b sinA = c . Prove that a sinA + b cosA = _+√a^2 + b^2 - c^2

  25. trig

    If (cosa-sina)/sina = 2 , then what is tga = ?

  26. precal desperate

    Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)

  27. math

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

  28. Math

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

  29. Maths

    Prove That Sin2A+SIN2B+SIN2C/SINA+SINB+SINC=8SinA/2SINB/2SINC/2

  30. Maths

    If sina+7sinb=4 (sinc+2sind) and cosa+7cosb=4 (cosc+2cosd), how do I prove that 2cos(a-d) =7cos(b-c)?

  31. 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

  32. math

    sinA+cosA=p ,secA+cosecA=q (cosA)^2/[2-2(sinA)^2-(cosecA)^2]=p^2/(2(p^2)-q^2

  33. Trigonometry

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

  34. Maths

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

  35. Math, Inequalities

    Prove the following inequalities. Then state for which values the LHS equals RHS. 1) a^2 + b^2 ≥ 2(a-b-1) 2) Given a + b = 1, prove the inequality a^2 + b^2 ≥ 1/2 Please explain how you solved it. Thanks.

  36. Math

    A=5 sec(A)/1-4sinA.sinA +cosecA/4cosA.cosA-1 find value

  37. trigonometry

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

  38. 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

  39. maths

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

  40. maths

    if 13 cos a=12, find the the value of sec a+sina?

  41. trig

    how do you do sinAcosA=cosA-cos^3A/sinA

  42. maths trignometry

    Prove that. √seca+2sina/seca-2sina=Sina+cosa/sina-cosa

  43. 11

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

  44. Maths

    (x squared +y squared +z squared) / 3 = (x/3+y/3+z/3) squared Prove that if LHS equals to RHS, then all x=y=z Thank you

  45. math

    If sina+7sinb=4 (sinc+2sind) and cosa+7cosb=4 (cosc+2cosd), how do I prove that 2cos(a-d) =7cos(b-c)?

  46. trig

    Please help me how to do this: 1) 1 + sina*cosa / (cosa + sina)^2 = 2) sina + cosa / 1- 2sin^2a =

  47. 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

  48. 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

  49. 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)

  50. trig

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

  51. 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

  52. 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

  53. 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

  54. math

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

  55. 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

  56. math

    sinA+cosA=p ,secA+cosecA=q (cosA)^2/[2-2(sinA)^2-(cosecA)^2]=p^2/(2(p^2)-q^2

  57. Maths

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

  58. Trig

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

  59. 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 =

  60. algebra

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

  61. 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

  62. Algebra

    I'm not quite sure about these problems. I know how to do them, but it seems that I get the wrong answer. Maybe I'm supposed to get 'no solution' but I'm not sure. Could someone please help me with them? 5|6-5x|=15x-35 2|3x-7|=10x-8 1/4|4x+7|=8x+16 Ok for

  63. 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

  64. Math

    If secB=x,tanB=y(cosecA-cotA)=4/3,sinA+cosA=?

  65. Maths

    Test the solution of an equation: Prove that x=5 is a solution of the equation: 3x-3=2x+2 LHS= RHS= LHS=RHS,ie x=5 is the solution.

  66. mathematics trignometry

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

  67. maths(trigonometry)

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

  68. 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

  69. 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

  70. Trig - Ambiguous Cases

    Triangle HAV has

  71. 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)).

  72. Math - Vectors

    If "u = (2,2,-1)", "v = (3,-1,0)" and "w = (1,7,8)", verify that "u (dot) (v + w) = u (dot) v + u (dot) w". My work: LHS: u (dot) (v + w) = (2,2,-1) (dot) (4,6,8) = [(2,2,-1) (dot) (3,-1,0)] + [(2,2,-1) (dot) (1,7,8)] = [u (dot) v] + [u (dot) w] Therefore,

  73. trig

    Solve (1+tan square A)(1-sinA)(1+ sinA)

  74. Maths trigonometry

    Prove that cosec A_cotA by cosecA+Costa + cosecA+ Cot A by cosecA_cotA=2 cosec squareA_1=2×1+cos squares by1_cos squareA

  75. trig

    Prove : (sinA-cosA+1)/(sinA+cosA-1) = (1+sinA)/cosA

  76. math

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

  77. trig

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

  78. trig

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

  79. 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 ???

  80. trig

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

  81. Math: Law of Vectors (Cross Product)

    (au) × v + (bu) × v = [(a + b)u] × v u = ( x , y , z ) v = ( x₂, y₂,z₂) LHS: = (au) × v + (bu) × v = [ ay z₂- y₂az , - (axz₂- x₂az) , axy₂- x₂ay ] + [ by z₂- y₂bz , - (bxz₂- x₂bz) , bxy₂- x₂by ] RHS: = [(a + b)u] × v = [

  82. trig

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

  83. 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

  84. algebra

    prove that cosA/1-sinA=2cosecA

  85. Math trigonometry

    Prove sinA/1+cosA =tan1/2A

  86. mathamethics

    RHS and LHS . 5p + 3 = 2p + 9

  87. mathamethics

    RHS and LHS . 5p + 3 = 2p + 9

  88. math

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

  89. Advanced Mathematics

    verify that cos(90+A)=-sinA is an identity.

  90. Trigonometric Identities

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

  91. Math

    Find angle A if it is greater than or equal to 0 degrees and smaller than or equal to 180 degrees. round to the nearest tenth of a degree, if necessary. a) sinA = 0.5 b) cosA = -0.5 e) cosA = 0.4561 g) sinA = 0.5736 PLEASE HELP WID THIS!!:( i tried so

  92. Physics please help me!

    Prove the law of sines for triangle ABC i.e sinA/a=sinB/b=sinC/c.0 please help me!!!

  93. 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 +

  94. 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?

  95. math

    Given that [sin(A-B)/cos(A+B)]=1/3[tan(A-B)], find the values of cosB if sinA=1/2

  96. Math2

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

  97. math

    SinA➖cosA/sinA➕cosA➕sinA➕cosA/sinA➖cosA=-2/cos2A

  98. Trigonomentry plz help

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

  99. trigonometry

    sinA= 3/5 and C=17 Finding a and b Their two triangles and i have to find the ratio i just can’t seem to set up the problem right but i gave an example of one of the practice exercise that dealt with finding only (a) so i got confused with finding a and

  100. 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

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