Question 1083375
The sine has a range between -1 and 1.  0.3* sine -0.1 has a range from -0.1 when sine is 0 to 0.2, to -0.4
The range is (-0.4, 0.2) or 0.6 total.
Here's the graph anyway.

{{{graph(300,300,-1,1,-0.5,0.5,0.3(sin(30x+1.5))-0.1)}}}