0.049*sin(x)/cos(x-5)+0.6*(1+sin(x))=0.05
    0.049*sin(x)/cos(x-5)+0.6*(1+sin(x))=0.05
    x^2+200*x+20000=48400
    36/x十20x一20x=55
    e^x+e^（-x）
    （3400*9000+5000*x）/（9000+x）=4000
    （3400*9000+4500*x）/（9000+x）=4000
    0.0000176＝（x*x）/（0.1-x）
    10000/(125.64+x)+7800/(185.64+x)+10000/（185.64+x）=150
    （650＋X）/（406.25＋X）＝1.4
    0.9Q*Q-2Q+15=60
    15x^2-3600x-60000=0
    a+a^2=0.75
    a+a^2=0.75
    3Q2-4Q+16=48
    4X^2+48X+155=0
    35+8L-L2=0
    35+8L-L2=0
    35+16L-3L2=0
    35+8L-L2=35+16L-3L2

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