`X+(x^(3))/(3)+(x^(5))/(5)+...``2(x+(x^(3))/(3)+(x^(5))/(5)+....)``(1)/(2)(x+(x^(3))/(3)+(x^(5))/(5)+...)` `-(1)/(2)(x+(x^(3))/(3)+(x^(5))/(5)+...)`
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