Check sibling questions

If sin θ = x

Then putting sin on the right side

  θ = sin -1 x

  sin -1 x = θ


So, inverse of sin is an angle.


Similarly, inverse of all the trigonometry function is angle.


Note : Here angle is measured in radians, not degrees.


So, we have

  sin -1 x

  cos -1 x

  tan -1 x

  cosec -1 x

  sec -1 x

  tan -1 x

Let’s take an example


We know that

  sin 30° = ½

Writing angle in radians

  sin π/6 = ½

  π/6 = sin -1 ½

  sin -1 ½ = π/6

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.