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Popular >

cos(8/3 pi)

Solution

cos (\frac{8}{3} π)

Solution

- \frac{1}{2}

+1

Solution steps

cos (\frac{8}{3} π)

Simplify:

\frac{8}{3} π = \frac{8 π}{3}

= cos (\frac{8 π}{3})

cos (\frac{8 π}{3}) = cos (\frac{2 π}{3})

= cos (\frac{2 π}{3})

Use the following trivial identity:

cos (\frac{2 π}{3}) = - \frac{1}{2}

= - \frac{1}{2}

Popular Examples

cos (35.8899 4^{\circ})

128+127.5sin((2pi)/(16)*13)

128 + 127.5 sin (\frac{2 π}{16} \cdot 13)

128+127.5sin((2pi)/(16)*11)

128 + 127.5 sin (\frac{2 π}{16} \cdot 11)

178.09 sin (6 5^{\circ})

128+127.5sin((2pi)/(16)*12)

128 + 127.5 sin (\frac{2 π}{16} \cdot 12)

Frequently Asked Questions (FAQ)

What is the value of cos(8/3 pi) ?
The value of cos(8/3 pi) is -1/2