x/cos(x),x=b - b^3/2 + (13 b^5)/24 - (541 b^7)/720 + (9509 b^9)/8064,b=0.2x/cos(x),x=b - b^3/2 + (13 b^5)/24 - (541 b^7)/720 + (9509 b^9)/8064,b=0.2

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