Question

Вычислите: cos(5x+pi/4)=0
ещё cos(x/5+pi/3)= в корне 2/2

Answer 1

$cos(5x + pi div 4) = 0$
$5x + frac{pi}{4} = frac{pi}{2} + kpi$
$5x = frac{pi}{2} - frac{ pi }{4} + kpi$
$x = frac{pi}{20} + frac{kpi}{5}$

Answer 2

.......................