sin18^°sin42^°sin78^°csc54^°=?

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sin 78^{\circ} - sin 18^{\circ} + sin 30^{\circ} - sin 42^{\circ}

\sin 6 ° \sin 42 ° \sin 66 ° \sin 78 ° = \frac{1}{16}

$s i n 6^{\circ} s i n 42^{\circ} s i n 66^{\circ} s i n 78^{\circ} = \frac{1}{16}$

sin 78^{\circ} - sin 18 + cos 132^{\circ}

sin 78^{\circ} - sin 66^{\circ} - sin 42^{\circ} + sin 6^{\circ}

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