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cos^(2)10^(@)-cos10^(@)*cos50^(@)+cos45^...

cos^(2)10^(@)-cos10^(@)*cos50^(@)+cos45^(@)

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The value of cos^(2)10^(@)-cos10^(@)cos 50^(@)+cos^(2)50^(@) is k/2 . The value of k is ________.

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cos130^(@)+cos110^(@)+cos10^(@)=0