If you’ve ever watched a spy movie, you noticed that the spy always seems to have multiple passports, each showing a different identity. However, we as the viewers know that all these identities are just different ways of representing the same person. Well, trigonometric functions are similar to the passports -- they can be represented differently at times. By studying trigonometric identities, we will go over some of these identities so that you can recognize a trigonometric function no matter how it may be disguised.Learn this and go on to Trigonometric Reciprocal Relationships
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