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OpenStudy (anonymous):
9 cos^3 x = 9 cos x
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OpenStudy (jonnyvonny):
You can't prove this, but you can get one side alone by dividing by 9cos(x).\[\cos^2(x)=1\]
OpenStudy (campbell_st):
rewrite the equation as \[9 \cos^3(x) - 9\cos(x) = 0\] now factor the equation and you find the values that make the equation true..
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