# Find exact value of \sin 495 degrees without a calculator?

Find exact value of $\mathrm{sin}495$ degrees without a calculator?
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rogreenhoxa8

For $\mathrm{sin}\alpha$ you must have ratio of side opposite of $\alpha$ and chord total triangle angels is 180 and $\mathrm{sin}$ of 180 is 0 so i think $\mathrm{sin}495$ be a negative number$\mathrm{sin}\alpha =\frac{a}{c}$ ( side opposit of alpha / chord)