Evaluate
-\frac{\pi }{8}\approx -0.392699082
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\frac{4\pi }{8}-\frac{5\pi }{8}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 2 and 8 is 8. Multiply \frac{\pi }{2} times \frac{4}{4}.
\frac{4\pi -5\pi }{8}
Since \frac{4\pi }{8} and \frac{5\pi }{8} have the same denominator, subtract them by subtracting their numerators.
\frac{-\pi }{8}
Combine like terms in 4\pi -5\pi .
Examples
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Simultaneous equation
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Differentiation
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Integration
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Limits
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