If y=cot^-1{√(1+t^2)-t},x=cot-^1 (1+t)/(1-t), find dy/dx
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༄ᶦᶰᵈ᭄✿༺Sᴜᴅɪᴘтᴀ bOsS ༻꧂
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༄ᶦᶰᵈ᭄✿༺Sᴜᴅɪᴘтᴀ bOsS ༻꧂
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