Question 731623
f(x)=20sin(30*x)-10 determine when f(x)=-20
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20sin(30x) - 10 = -20
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20sin(30x) = -10
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sin(30x) = -1/2
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30x = -pi/6 or 30x = 7pi/6)
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In radians:
x = -pi/180 or x = (7pi)/180
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In degrees:
x = -1 degree or x = 7 degrees

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Cheers,
Stan H.