Question

Se x = π/2, obter o valor de :

Answer 1

x=π/2 = 90° 

sen x + 2cotg(x/2) - cos 2x / tg(x/2) . cosec x + sec 4x 

sen 90° + 2cotg(45°) - cos 180° / tg(45°) . cosec 90° + sec 360° 

1 + 2 * 1 - (-1)/1*1 + 1 

sen 90° = 1 
cotg 45° = 1 
cos 180° = -1 
tg 45° = 1 
cosec 90° = 1 
sec 360° = 1 

Taí