# 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)

5,075 results
1. ## maths

Prove SinA/1-CosA = CosecA + CotA

2. ## Trigonometry

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

3. ## maths

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

4. ## Math

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

5. ## Maths

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

6. ## 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

7. ## maths

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

8. ## Maths

Express cosA in terms of cotA

9. ## 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

10. ## Maths

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

11. ## maths

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

12. ## Maths

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

13. ## Math

Prove that. (1+sec2A) (1+sec4A) (1+sec8A)=Tan8A×CotA

14. ## maths(trigonometry)

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

15. ## 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))

16. ## trigonometry

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

17. ## trig

establish the identity: cot(A-B)= cotAcotB+1/cotB-cotA thanks for any help at all

18. ## math

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

19. ## 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..

20. ## math

4m=cotA(1+SinA), 4n=cotA(1-SinA) Proved that (m2-n2)=mn

21. ## maths

tanA+4cotA=4 find the value of tanA*tanA+cotA*cotA

22. ## math

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

23. ## trig

if 8 tan Q=15 then sinA-cosA=?

24. ## Math

Match each ratio in the first row with an equivalent ratio from the second row if angle A plus angle B = 90 degrees. SinA CosA TanA CscA SecA CotA SinB CosB TanB CscB SecB CotB Pleaseeee help!!

25. ## trigonometry

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

26. ## maths trignometry

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

27. ## Math

Prove that (cos2A)÷ ( 1+sin2A) = (cotA -1) ÷ (cotA +1)

28. ## 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

29. ## 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

30. ## Trig

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

31. ## Precal

How do i prove that left side equals right? Cot(A+B)=cotAcotB-1/(cotA + cotB)

32. ## Math

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

33. ## Maths

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

34. ## trig

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

35. ## 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

36. ## math

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

37. ## math

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

38. ## algebra

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

39. ## Trigonometric Identities

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

40. ## maths

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

41. ## Geometry

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

42. ## Maths, Divine International Public School

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

43. ## math

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

44. ## 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)

45. ## math

Prove the identity tanA/secA+1 + cotA/cosecA+1=cosecA+secA -secAtanA

46. ## trig

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

47. ## Math

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

48. ## 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

49. ## trig

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

50. ## Math

(secA-cosecA)(1+tanA+cotA)= tanAsecA-cotAcosecA

51. ## math

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

52. ## 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

53. ## math

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

54. ## 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?

55. ## Maths

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

56. ## 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

57. ## trig

Match each ratio in the first row with an equivalent ratio from the second row if angle A plus angle B = 90 degrees. SinA CosA TanA CscA SecA CotA SinB CosB TanB CscB SecB CotB Does this question even make sense?

58. ## 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

59. ## Maths trigonometry

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

60. ## 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

61. ## trig

if 5cos A plus 3=0 and 180

62. ## Trigonometric Identities

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

63. ## Math

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

65. ## maths

tanA/secA-1 + tanA/secA+1 = 2 cosecA

66. ## trig

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

67. ## math

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

68. ## Tc Maths

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

69. ## math urgent

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

70. ## trig

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

71. ## trig

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

72. ## 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

73. ## Math

If 1-cosA=5/13, prove that 25sinA(sinA - cosA)

74. ## Trigonometry

I need to prove that the following is true. Thanks. csc^2(A/2)=2secA/secA-1 Right Side=(2/cosA)/(1/cosA - 1) = (2/cosA)/[(1-cosA)/cosA] =2/cosA x (cosA)/(1-cosA) =2/(1-cosA) now recall cos 2X = cos^2 X - sin^2 X and we could say cos A = cos^2 A/2 - sin^2

75. ## 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

76. ## mathematics trignometry

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

77. ## trig

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

78. ## 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

79. ## math

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

80. ## Math

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

81. ## 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

82. ## trig

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

83. ## Trig

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

84. ## Trig

prove that tanA divided by the sinA equals the secA

85. ## trigonometry

express secA in terms of cotA? can you pleas say how to solve this??

86. ## Maths

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

87. ## maths

1-cosA+sinA DIVIDED BY 1+cosA+sinA

88. ## Trigonomentry help!!!

SinA+ cosA=17/3 find sinA-cosA

89. ## Math trigonometry

Prove sinA/1+cosA =tan1/2A

90. ## algebra

prove that cosA/1-sinA=2cosecA

91. ## 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 ???

92. ## math

Sina+cosa=root over cosA

93. ## math

Sina+cosa=root over cosA

94. ## trig

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

95. ## Math

Hello! I have been learning about proving identities and can do simple ones but lately I have been really struggling. I am currently stuck on this problem. cos(A-B)/tan(A)+cot(B) = sin(B)/sec(A) I managed to get to: cosAcosB-sinAsinB/(sinA/cosA) +

96. ## math

(secA+tanA)(1-sinA)

97. ## further Mathematics

Let A=(cosA -sinA) (sinA cosA) show that A^2=(cos2A sin2A) (sin2A cos2A)

98. ## trig

SinA =0.5 cosA=?

99. ## math

sinA=.....+cosA

100. ## math

sinA=.....+cosA