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

Mar 31, 2020

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.