`4 cos 20^(@)-sqrt(3)cot20^(@)``(2cos40^(@)-COS20^(@))/(sin20^(@))``cos^(6)(pi)/(16)+cos^(6)(3pi)/(16)+cos^(6)(5pi)/(16)+cos^(6)(7pi)/(16)``TAN10^(@)-TAN50^(@)+tan70^(@)`
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