Question

Cine ma poate ajuta clasa a 10a Ecuatii trigonometrice VA ROG

Answer 1

$2sin7x+ \sqrt{2} = 0$
$sin7x = - \frac{ \sqrt{2} }{2}$
[tex]7x = (-1)^k arcsin(- \frac{ \sqrt{2} }{2}) + kpi [/tex]
$7x = (-1)^{k+1} \frac{ \pi }{4} + kpi$
$x = (-1)^{k+1} \frac{ \pi }{28} + \frac{kpi}{7}$, unde k este un numar intreg