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How can I work out exact values for trig functions like sin(30) and cos(3pi/2)?

- Thread starter cscott
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- #1

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How can I work out exact values for trig functions like sin(30) and cos(3pi/2)?

- #2

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- #3

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Like the decimal values? Without a calculator?cscott said:How can I work out exact values for trig functions like sin(30) and cos(3pi/2)?

I would just draw out the triangle and leave the answer in the exact radical form, like in your first example. But [itex]\cos{\frac{3\pi}{2}}[/itex] is 0 so that should be easy.

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Ah thanks.

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