12000－x＝20％x
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x))=1
    2X=1
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    (0.049*sin(x)/cos(x-5))+0.01*(1+sin(x))=1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x))=1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x))
    SIN(30)
    SIN30
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x))=1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x))=1

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