sin²x + cos²x ≡1 , 1 + tan²x ≡ sec²x , 1 + cot²x ≡ cosec²x

In this video you are shown the Pythagorean identities and how they are derived. In a later tutorial you will have to prove identities using these.

Pythagorean Identities:

  • sin2θ + cos2θ ≡ 1
  • 1 + tan2θ ≡ sec2θ
  • 1 + cot2θ ≡ cosec2θ

New · Axi

Stuck on this topic?

Axi, our AI tutor, answers questions on sin²x + cos²x ≡1 , 1 + tan²x ≡ sec²x , 1 + cot²x ≡ cosec²x – no copying, no pasting, no sign-up.