Posted by please help now on Sunday, February 26, 2012 at 12:58pm.
What does x€ [-90,180] mean?
The domain limits of x?
You seem to have omitted a parenth after x+60
cos(x+60) = sin(90-x-60)
= sin (30-x)
sin2x = sin(30-x)
Therefore 2x = 30 -x
x = 10 degrees is one solution
See if you can find others. Note that sin2x = sin(180 -2x); that will lead to another solution.
Yes it mean domaim limit of x that guied u when plot the graph
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