681 306 : 69454 779 : 507​

<span>sin6x=sin8x</span>

<span><span>sin6x-sin8x=0</span></span>

<span><span>2sin(6x-8x)/2cos(6x+8x)/2=0</span></span>

<span><span>sin(-x)cos7x=0</span></span>

<span><span>-sinxcos7x=0</span></span>

<span><span>sinx=0     или cos7x=0</span></span>

<span><span>x=pi n            7x=pi/2+pi k</span></span>

<span><span>                        x=pi/14+1/7pi k</span></span>