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Question Number 85313 by john santu last updated on 20/Mar/20

$$\tan {}^2\left({20}^{\mathrm{o}}\right)+\tan {}^2\left({40}^{\mathrm{o}}\right)+\tan {}^2\left({80}^{\mathrm{o}}\right)=$$

Answered by john santu last updated on 20/Mar/20

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