Question 1073767
Let {{{u=sin(x)}}}
{{{7u^2-14u+2=-5}}}
{{{7u^2-14u+7=0}}}
{{{u^2-2u+1=0}}}
{{{(u-1)^2=0}}}
{{{u-1=0}}}
{{{u=1}}}
{{{sin(x)=1}}}
{{{x=((2n+1)/2)*pi}}} where {{{n}}} is any integer.