Mathematics, 13.07.2019 18:00 oprajapati

Use a sum or difference formula to find the exact value of the following. $sin\frac{13\pi}{28}cos\frac{2\pi}{7 }+cos\frac{13\pi}{28}sin\frac{2\pi} {7}$

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Use a sum or difference formula to find the exact value of the following. [tex] sin\frac{13\pi}{28}c...

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