prove the first trigonometric identity
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The three main functions in trigonometry are Sine, Cosine and Tangent. That is our first Trigonometric Identity.
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For instance, sin(x) = 1/csc(x) is an identity. To "prove" an identity, you have to use logical steps to show that one side of the equation can be transformed into the other side of the equation. You do not plug values into the identity to "prove" anything. There are infinitely-many values you can plug in
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