-50√3tg 420°=-50√3tg(360°+60°)=-50√3tg 60°=
=-50√3√3=-50×9=-450
(tg 60°=√3)
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-50√3tg 420°=-50√3tg(360°+60°)=-50√3tg 60°=
=-50√3√3=-50×9=-450
(tg 60°=√3)