2cos²(x + 30) = 1

[Gordon Freeman]

Qe rezulltati ;

X1=15° + k360°
X2=-75° + k360°


qeshtu e ki


Prova :


2cos²(x + 30°) = 1
cos²(x + 30°)= 1/2
cos(x + 30°) = √2 /2

cos(x1 + 30°) = cos(45° + k360°)
x1+30°= 45° +k360°
x1=45°-30° + k360°
x1=15° +k360°
----------------------

cos(x2 + 30°) = cos(-45° + k360°)
x2 + 30°=-45° + k360°
x2=-45° - 30° + k360°
x2=-75° + k360°

[francovice]

Shume faleminderit te gjitheve