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Evaluate each of the following (cos 0° + sin 45° + sin 30°)/(sin 90° − cos 45° + cos 60°)

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Evaluate each of the following

(cos 0° + sin 45° + sin 30°)/(sin 90° − cos 45° + cos 60°)

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(cos 0° + sin 45° + sin 30°)(sin 90° − cos 45° + cos 60°) …(i)

By trigonometric ratios we have

By substituting above values in (i), we get

by (10 points)
How'd you changed the denominator and numerator after substituting them ? Please explain
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