Solving a radical polynomial with trig substitution

Описание к видео Solving a radical polynomial with trig substitution

I have mixed feelings about this one. It took me about 8 months to finally try what I was thinking but doubting just because I underestimated what I was assuming. This, I believe was intentionally formulated to have only one way of solving it algebraically. The key to solving this is knowing the formula of tan(3x)

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