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The value of $\sin (\frac{π}{18}) \sin (\frac{5 π}{18}) \sin (\frac{7 π}{18})$ , is

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Correct option is C

We havesin⁡π18sin⁡5π18sin⁡7π18=cos⁡π2−π18cos⁡π2−5π18cos⁡π2−7π18=cos⁡8π18cos⁡4π182π8cos⁡2π8=cos⁡π9cos⁡2π9cos⁡4π9=sin⁡23⋅π/9231sin⁡π/9=123=18

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The value of sin π18sin⁡5π18sin⁡7π18, is

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The value of $\sin (\frac{π}{18}) \sin (\frac{5 π}{18}) \sin (\frac{7 π}{18})$ , is