The value of \( \tan 15^{\circ} \tan 20^{\circ} \tan 70^{\circ} \tan 75^{\circ} \) is (a) \( -1 ...

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The value of \( \tan 15^{\circ} \tan 20^{\circ} \tan 70^{\circ} \tan 75^{\circ} \) is
(a) \( -1 \)
(b) 2
(c) 0
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