Question

решить уравнения: 1.sin x =0 2. cos x = -0,4827 3. tg x =0 4. tg x =-0,5 5. cos x = 0 6. sin 2x = -1

Answer 1

sinx=0.2 => x=(-1)^n*arcsin(0.2)+pi*n cos(x)=-0.4827 =>x=+-arccos(-0.4827)+2pi*n tg(x)=-0.5 =>x=arctg(-0.5)+pi*n cosx=0.6 =>x=+-arccos(0.6)+2pi*n sin2x=-1 => 2x=-pi/2+2pi/n и x=-pi/4+pi/n