Explain how the graph of y=-2sin(x)-1 differs from the parent function. make sure to compare key points used for graphing

You can obtain the graph of the function y=-2sinx-1 from the graph of the function y=sinx making such transformations:
1.  the multiplication by -2 increases y value twice and then  symmetrically reflects the graph y=2sinx about the x-axis;
2. adding -1 to the  y=-2sinx you translate the graph 1 unit down.

On the added picture black line is a graph of y=sinx and red line is a graph of y=-2sinx-1.

Check:
1. When x=0, y=-2sin0-1=-1;
2. When , then .