lst=[["x^3*tan(b*x+a)","x",1],
["x^2*tan(b*x+a)","x",1],
["x*tan(b*x+a)","x",1],
["tan(b*x+a)/x","x",0],
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["tan(b*x+a)^2/x","x",0],
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["x^3*tan(b*x+a)^3","x",1],
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["x*tan(b*x+a)^3","x",1],
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