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Question Number 129801 by bramlexs22 last updated on 19/Jan/21

cot 15° cot 16° cot 17°... cot 75°=

$$\:\mathrm{cot}\:\mathrm{15}°\:\mathrm{cot}\:\mathrm{16}°\:\mathrm{cot}\:\mathrm{17}°...\:\mathrm{cot}\:\mathrm{75}°= \\ $$

Answered by EDWIN88 last updated on 19/Jan/21

=1 [ cot 15°=tan 75° etc ]

$$=\mathrm{1} \\ $$$$\:\left[\:\mathrm{cot}\:\mathrm{15}°=\mathrm{tan}\:\mathrm{75}°\:\mathrm{etc}\:\right]\: \\ $$

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