1.

Evaluate `lim_(x to pi)((1+cosx)/(tan^(2)x)).`

Answer» `lim_(x to pi)((1+cosx)/(tan^(2)x))=lim_(x to pi)(cos^(2)x(1+cos x))/(sin^(2)x)`
`=lim_(x to pi)(cos^(2)c(1+cosx))/((1-cos^(2)x))`
`=lim_(x to pi)(cos^(2)x)/((1-cosx))=1/2" "["putting x"=pi.].`


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