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Establish the identity.
Multiply and write the left side expression as the difference of two squares.

Ask by Hammond Huang. in the United States
Jan 23,2025

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To establish the identity , we can start by rewriting the left-hand side as a difference of squares:
Now, we can use the Pythagorean identities. Recall that .
Substituting this into our expression gives us:
Thus, we have established that:
This shows that the identity holds true!

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