Evaluate
-\alpha +\frac{\pi }{2}
Factor
\frac{\pi -2\alpha }{2}
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\frac{\pi }{2}-\frac{2\alpha }{2}
To add or subtract expressions, expand them to make their denominators the same. Multiply \alpha times \frac{2}{2}.
\frac{\pi -2\alpha }{2}
Since \frac{\pi }{2} and \frac{2\alpha }{2} have the same denominator, subtract them by subtracting their numerators.
\frac{\pi -2\alpha }{2}
Factor out \frac{1}{2}.
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