Conditional Identities
Always true or true on a condition? · A + B = 90° · A + B + C = 180°
Tell an identity from a conditional identity
Use A + B = 90° and A + B + C = 180°
Verify a relation for given angles
Show a relation fails with one example
sin 2θ = 2 sin θ cos θ
cos 3θ = 4 cos³θ - 3 cos θ
sin(A + B) = sin A cos B + cos A sin B
sin A + cos B = 1
tan A = cot B
🔐
The notes are free to read in full.
Create free account Sign in