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- Feb 14, 2012
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Without the use of a calculator, evaluate \(\displaystyle \tan^2 20^{\circ}+\tan^2 40^{\circ}+\tan^2 80^{\circ}\).
In the link provided by opalgs aboveWithout the use of a calculator, evaluate \(\displaystyle \tan^2 20^{\circ}+\tan^2 40^{\circ}+\tan^2 80^{\circ}\).