Problem:
Identities of Plane Trigonometry
Important Formulas and their Explanations (VI):
Identities of Plane Trigonometry
Pythagorean Relation
Pythagorean Identities
Pythagorean Identities
(a) (sin x)2 + (cos x)2 = 1
(b) 1 + (tan x)2 = (sec x)2
(c) 1 + (cot x)2 = (cosec x)2