Răspunsuri

2014-02-16T15:48:30+02:00
Sin(x/2) + cos(x) = 0 
sin(x/2) + [1 - 2sin²(x/2)] = 0 
2sin²(x/2) - sin(x/2) - 1 = 0 
[2sin(x/2) + 1][sin(x/2) - 1] = 0 
sin(x/2) = -1/2 or sin(x/2) = 1 
2014-02-16T16:00:55+02:00
Sin(x/2) + cos(x) = 0 
sin(x/2) + [1 - 2sin²(x/2)] = 0 
2sin²(x/2) - sin(x/2) - 1 = 0 
[2sin(x/2) + 1][sin(x/2) - 1] = 0 
sin(x/2) = -1/2 or sin(x/2) = 1