Tg2x
|x|sinx+x=0 1. x=0 2. x>0 x(sinx+1)=0 sinx=-1 x=3π/2+2πk k∈Z; k≥0 3. x<0 -xsinx+x=0 x(-sinx+1)=0 sinx=1 <strong> x=-3π/2+2πk k∈Z; k≤0