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Prove that : ...

Question

Prove that : ${c o s 10}^{o} {c o s 30}^{o} {c o s 50}^{o} {c o s 70}^{o} = \frac{3}{16}$

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Solution

$= c o s 10^{\circ} c o s 30^{\circ} c o s 50^{\circ} c o s 70^{\circ}$

$= 0.9848 * 0.8660 * 0.6427 * 0.3420$

$= 0.1875$

$= 3 / 16$

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