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4. Prove that 11 is an irrational number. You can use statements proved in class.
PROVE Addition Formula for Sine In the text, we proved only addition and subtraction Formulas for Cosine. Use these formulas and the cofunction identities
to prove the addition Formula for Sine. [Hint: To get started, use the first cofunction identity to write
and use the Subtraction Formula for Cosine]
