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Question Number 136475 by EDWIN88 last updated on 22/Mar/21
Commented by EDWIN88 last updated on 22/Mar/21
Usethefactthatcscx=1x+x6+7x3360+31x515120+...for∣x∣<πtofindthefirstfourtermsoftheseriesfor2csc(2x)[for∣x∣<π2andthusforln(tanx).(a)ln∣x∣+x212+7x41440+31x690720+...(b)ln∣x∣−x23+7x490−62x62835+...(c)ln∣x∣+x23+7x490+62x62835+...(d)ln∣x∣−x212+7x41440−31x690720+...
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