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Prove that cos `6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)`
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Prove that cos `6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)`
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Prove that cos `6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)`
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