How do you find the value of the function $sin (\frac{9 π}{7})$ $sin ((9pi)/7)$ ?

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How do you find the value of the function $sin (\frac{9 π}{7})$ $sin ((9pi)/7)$ ?

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Answer 1 · 2016-12-17T06:02:44

0.78

Explanation:

$sin (\frac{9 π}{7}) = sin (\frac{2 π}{7} + π) = - sin (\frac{2 π}{7})$ $sin ((9pi)/7) = sin ((2pi)/7 + pi) = - sin ((2pi)/7)$
$\frac{2 π}{7} - \to \frac{360}{7} = 51^{\circ} 43$ $(2pi)/7 --> 360/7 = 51^@43$
Calculator --> sin 51.43 = 0.78
There for:
$sin (\frac{9 π}{7}) = - 0.78$ $sin ((9pi)/7) = - 0.78$ .

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How do you find the value of the function $sin (\frac{9 π}{7})$ $sin ((9pi)/7)$ ?

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How do you find the value of the function $sin (\frac{9 π}{7})$ $sin ((9pi)/7)$ ?