Evaluate
\frac{3\pi }{4}\approx 2.35619449
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\frac{13\pi }{12}-\frac{4\pi }{12}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 12 and 3 is 12. Multiply \frac{\pi }{3} times \frac{4}{4}.
\frac{13\pi -4\pi }{12}
Since \frac{13\pi }{12} and \frac{4\pi }{12} have the same denominator, subtract them by subtracting their numerators.
\frac{9\pi }{12}
Combine like terms in 13\pi -4\pi .
\frac{3}{4}\pi
Divide 9\pi by 12 to get \frac{3}{4}\pi .
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