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Simplify \[\sin 70^\circ \cos 50^\circ + \sin 260^\circ \cos 280^\circ.\]

 Mar 31, 2020
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I think \( \sin 70^\circ \cos 50^\circ + \sin 260^\circ \cos 280^\circ.\)equals to \(\frac{\sqrt{3}}{4}\). I have heard that you can use caculator to symplifiy this! But I still think im right.

 Mar 31, 2020

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