NOTE DE TRIGONOMETRIE RECTILIGNE 



(V) 



a?« \ ;r/ V a?/ 1.2 \ a? 



, ., 7i(n—r—\)(n—r — 2)...(w — 2r+l) / 1 , 

 1.2.3 r \ X ' 



(VI) 



^ ^ ^^^. (7i-r)(n2r + l)...(n-'^- + l) f , 1 V'-'^^+^n 



(VII) w pair. 

 1 / 1 \ / 1 



r n [n—r — 1) (m — r— 2)... [n — 2r+l)/ 1 , 



^^"^y 1.2.3. ...r r~^' +■■■■ 



(VIII) Mimp. 



n (-n-r— 1) (ri-r— 2)... (w— 2?-+l) / __ A""]^' 

 ^'"^' ^ 1.2.3....r \ ~^y ^"" 



(IX) n pair. 



* /'"4.44)[(^4r+("-^'(^4)+-- 



(X) n imp. 



. (n-2r)(n— 2r + l)... (n— r+1) / __1 \ "-^^r+i) -i 

 ^^" '' 1.2.3....r ^ \~x) ^ J 



