Question 1026396
{{{sin(x)(sin(x)+1)=0}}}


Either {{{sin(x)=0}}}  Or  {{{sin(x)+1=0}}};



{{{sin(x)=0}}} will mean {{{system(cross(x=0),or,x=pi,or,cross(x=2pi))}}} IF you are interested in the interval  {{{0<x<2pi}}}.



{{{sin(x)+1=0}}},
{{{sin(x)=-1}}}----be careful and watch the sign.  To stay within the same interval,  {{{x=3pi/2}}}.


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Learn to understand and use the Unit Circle and the common reference angles.