Question

cos(Pi(x+2)/6)=корень из 2/2

Answer 1

pi(x+2)/6=+-pi/4+2pik

(x+2)/6=+-1/4+2k

x+2=+-3/2+12k

x1=12k-1/2

x2=12k-7/2

Answer 2

$cos(frac{pi(x+2)}{6})=frac{sqrt{2}}{2};\ frac{pi(x+2)}{6})=^+_-frac{pi}{4}+2*pi*k;\ x+2=^+_-frac{3}{2}+12*k;\ x=-2^+_-1.5+12*k;$

k є Z