Prove the following : 40^ + 50^ + 70^ + 80^ = 20^ + 10^ - Vidyadip

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Prove the following : $\cos 40^{\circ}+\cos 50^{\circ}+\cos 70^{\circ}+\cos 80^{\circ} \ =\cos 20^{\circ}+\cos 10^{\circ}$

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