The solution of the inequality is [0, 1.699].
We will graph y=cos(0.65x)-0.45 using a calculator. Image 1.
Then we draw the boundary x=0 and x=[tex]2\pi[/tex] on the same graph. And we try to find where y>0 on that graph. Image 2.
From the graph we see that y>0 that means cos(0.65x) > 0.45 is over the interval [0, 1.699].
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