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mastermind890 (324)

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[x ][ 1] (2-x)tan (X/2)

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titun (1529)

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Let [x ][ 1] (2-x)tan (X/2) = P
 
Therefore, ln P =  [x ][ 1] ln ( 2 - x ) / cot (  x / 2 )
 
This is in 0/0 form. So, applying, L.Hospitals rule,
 
ln P =  [x ][ 1]  2 /  (2-x) (cosec2( x / 2)) = 2 /
 
So, P = e 2 /  
 
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amar.gupta (590)

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good work titun

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I.e.irodov (5)

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Let [x ][ 1] (2-x)tan (X/2) = P

Therefore, ln P = [x ][ 1] ln ( 2 - x ) / cot ( x / 2 )

This is in 0/0 form. So, applying, L.Hospitals rule,

ln P = [x ][ 1] 2 / (2-x) (cosec2( x / 2)) = 2 /

So, P = e 2 /

Cheers !!
 this reply: 0 points  (with Olaaa!! Perrrfect answer.   in 0 votes )   [?]
 
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