Find the solutions of the equation.
2sinx+cosx=0
2sinx + cosx = 0
2sinx = -cosx
tanx = -1/2
Now you know there will be two solutions, in QII and QIV
2sinx+cosx=0
2sinx = -cosx
tanx = -1/2
Now you know there will be two solutions, in QII and QIV