trigonometric identity
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
An equation involving sine, cosine, tangent, or related functions that holds true for every possible value of the angle.
Usage notes
Unlike an ordinary equation, a trigonometric identity is true for every angle, not just a few solutions.
Test yourself
In your own words, what does "trigonometric identity" mean?
An equation involving sine, cosine, tangent, or related functions that holds true for every possible value of the angle.
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