the value of cot-1(cot(-10))

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c o t 5^{\circ} c o t 10^{\circ} . . . . . . . . . . . c o t 85^{\circ}

cot 10 ° (cot 40 ° - cot 50 °)

tan A + cot A = 2,

{tan}^{10} A + {cot}^{10} A

s i n^{- 1} (s i n \frac{33 π}{7}) + c o s^{- 1} (c o s \frac{46 π}{7}) + t a n^{- 1} (- t a n \frac{13 π}{8}) + c o t^{- 1} (c o t (- \frac{19 π}{8})) = \frac{a π}{b}

S = cot 10^{o}

cot 20^{o}

cot 160^{o}

cos 170^{o}

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