Evaluate
\alpha -\frac{\pi }{4}
Factor
\frac{4\alpha -\pi }{4}
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\frac{4\alpha }{4}-\frac{\pi }{4}
To add or subtract expressions, expand them to make their denominators the same. Multiply \alpha times \frac{4}{4}.
\frac{4\alpha -\pi }{4}
Since \frac{4\alpha }{4} and \frac{\pi }{4} have the same denominator, subtract them by subtracting their numerators.
\frac{4\alpha -\pi }{4}
Factor out \frac{1}{4}.
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