Răspunsuri

2014-09-05T20:25:27+03:00
Cos2x + sin2x = 2
=> cos 2x = sin 2x = 
√2 / 2
sin 2x + cos 2x = √2 / 2   +  √2 / 2  = 2√2 /2 = √2
 
 => 2x = π / 4 + 2kπ   (2x = 45°)
=> x = π / 8  + 2kπ    (x = 22,5° = 22°30' )