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Old 12-13-2011   #112
IM@D
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When engineers fail to express their feelings, they use functions:

sqrt(cos(x))*cos(200 x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(9-x^2), -sqrt(9-x^2) from -4.5 to 4.5

p.s : copy paste it on google
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