Question

Define an trigonometric identity.

Answer 1

Answer with Step-by-step explanation:

An equation involving trigonometry ratios of an angle is called a trigonometric identity, if it is true for all values of the angles involved. For any acute angle θ, we have the following identities.

i) sin² θ + cos² θ = 1 , ii) 1 + tan² θ = sec² θ , iii) cot² θ +1 = cosec² θ, iv) tan θ = sin θ/cos θ , v)  cot θ = cos θ / sin θ.

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Answer 2

Answer:

• Trigonometric identities are the equalities that are absolutely true for only right angled triangles.
• Trigonometric identities involve trigonometric functions.