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[" 87.If "(dy)/(dx)+(3)/(cos^(2)x)y=(1)/...

[" 87.If "(dy)/(dx)+(3)/(cos^(2)x)y=(1)/(cos^(2)x),x in((-pi)/(3),(pi)/(3))," and "],[y((pi)/(4))=(4)/(3)," then "y(-(pi)/(4))" equals "],[[" (1) "(1)/(3)+e^(6)," (2) "(1)/(3)," (3) "-(4)/(3)," (4) "(1)/(3)+e^(3)]]

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