Evaluate
\frac{7\pi }{4}\approx 5.497787144
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\frac{5\pi }{4}+\frac{2\pi }{4}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 4 and 2 is 4. Multiply \frac{\pi }{2} times \frac{2}{2}.
\frac{5\pi +2\pi }{4}
Since \frac{5\pi }{4} and \frac{2\pi }{4} have the same denominator, add them by adding their numerators.
\frac{7\pi }{4}
Combine like terms in 5\pi +2\pi .
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