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Trigonometry Values

Trigonometry Value Chart, Ratios, Formulas and Values

Trigonometric ratios of ratios like sine, cosine, tangent, cotangent, secant, and cosecant are beneficial in solving and dealing with the length and angles of a right-angled triangle. Some typical values of trigonometric functions that help us in solving the trigonometric problems are 0°, 30°, 45°, 60°, and 90°.

Trigonometric ratios

 The three major ratios are sin, cos and tan.

  • Sine or sin θ = Side opposite to θ / Hypotenuse = BC / AC
  • Cosines or cos θ = Adjacent side to θ / Hypotenuse = AB / AC
  • Tangent or tan θ = Side opposite to θ / Adjacent side to θ = BC / AB

    Similarly, by reciprocating them, we get Sec, Cosec and Cot ratios.

  • Sec θ = 1/Cos θ = Hypotenuse / Adjacent side to θ = AC / AB
  • Cosec θ = 1/Sin θ = Hypotenuse / Side opposite to θ = AC / BC
  • Cot θ = 1/tan θ = Adjacent side to angle θ / Side opposite to θ = AB / BC

    Since they are reciprocal of each other, they cancel each other out when, multiplied together

  • Sin θ . Cosec θ =1
  • Cos θ . Sec θ =1
  • Tan θ . Cot θ =1

Trigonometric values

Angle (in degree)

30°

45°

60°

90°

Angle (in radian)

0

π /6

π /4

π /3

π /2

Sin θ

0

½

1/√2

√3/2

1

Cos θ

1

√3/2

1/√2

½

0

Tan θ

0

1/√3

1

√3

Cot θ

√3

1

1/√3

0

Sec θ

1

2/√3

√2

2

Cosec θ

2

√2

2/√3

1

 

Trigonometric formulas

  • Tan θ = sin θ/cos θ
  • Cot θ = cos θ/sin θ
  • Sin θ = tan θ/cos θ
  • Cos θ = sin θ/tan θ
  • Sec θ = tan θ/sin θ
  • Cosec θ = cos θ/tan θ
  • sin (90°- θ) = cos θ
  • cos (90°- θ) = sin θ
  • tan (90°- θ) = cot θ
  • cot (90°- θ) = tan θ
  • sec (90°- θ) = cosec θ
  • cosec (90°- θ) = sec θ
  • sin (90°+ θ) = cos θ
  • cos (90°+ θ) = -sin θ
  • tan (90°+ θ) = -cot θ
  • cot (90°+ θ) = -tan θ
  • sec (90°+ θ) = -cosec θ
  • cosec (90°+ θ) = sec θ
  • sin (180°- θ) = sin θ
  • cos (180°- θ) = -cos θ
  • tan (180°- θ) = -tan θ
  • cot (180°- θ) = -cot θ
  • sec (180°- θ) = -sec θ
  • cosec (180°- θ) = cosec θ
  • sin (180°+ θ) = -sin θ
  • cos (180°+ θ) = -cos θ
  • tan (180°+ θ) = tan θ
  • cot (180°+ θ) = cot θ
  • sec (180°+ θ) = -sec θ
  • cosec (180°+ θ) = -cosec θ
  • sin (270°- θ) = -cos θ
  • cos (270°- θ) = -sin θ
  • tan (270° - θ) = cot θ
  • cot (270° - θ) = tan θ
  • sec (270° - θ) = - cos θ
  • cosec (270° - θ) = - sec θ
  • sin (270°+ θ) = -cos θ
  • cos (270°+ θ) = sin θ
  • tan (270° + θ) = - cot θ
  • cot (270° + θ) = - tan θ
  • sec (270° + θ) = cosec θ
  • cosec (270° + θ) = - sec θ
  • sin (360°- θ) = -sin θ
  • cos (360°- θ) = cos θ
  • tan (360°- θ) = -tan θ
  • cot (360°- θ) = -cot θ
  • sec (360°- θ) = sec θ
  • cosec (360°- θ) = -cosec θ
  • sin (360°+ θ) = sin θ
  • cos (360°+ θ) = cos θ
  • tan (360°+ θ) = -tan θ
  • cot (360°+ θ) = -cot θ
  • sec (360°+ θ) = sec θ
  • cosec (360°+ θ) = -cosec θ

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