Math, asked by jungkook5, 1 year ago

cosA-sinA+1/cosA+sinA-1=cosecA+cotA....Prove this using the identity cosec²A=1+cot²A

Answers

Answered by mayankjha2003oud2yr
2

I have solved this question for you.

Hope it helps..

If you get help from this pls put a thumbs up and mark it as brainliest...

Attachments:

hrithiksoni1213: Easy method is also available for this question but your way is also right so i am giving you thanks and 3 Stars for your answer...
Answered by TRISHNADEVI
3

 \huge{ \underline{ \overline{ \mid{ \mathfrak{ \purple{ \:   \: SOLUTION \:  \: } \mid}}}}}

 \underline{ \mathfrak{ \:  \: To  \:  \: Prove :  \leadsto \:  \: }} \\  \\  \tt{ \frac{cos \:A - sin \: A + 1 }{cos \: A + sin \: A - 1}  = cosec \: A + cot \: A}

 \underline{ \mathfrak{ \:  \: Identity \:  \:  Used : \leadsto \:  \: }} \\  \\   \:  \:  \:  \:  \:  \:  \:  \: \boxed{ \bf{ \:  \: cosec {}^{2} A - cot {}^{2} A = 1 \:  \: }}

\tt {L.H.S.  = \frac{cos \:A - sin \: A + 1 }{cos \: A + sin \: A - 1} } \\  \\    \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \tt=  \frac{ \frac{cos \:A - sin \: A + 1}{sin \: A} }{ \frac{cos \: A + sin \: A - 1}{sin \: A} }  \\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \tt{=  \frac{ \frac{cos \: A}{sin \: A}  -  \frac{sin \:A }{sin \: A}  +  \frac{1}{sin \:A } }{ \frac{cos \:A }{sin \: A}  +  \frac{sin \:A }{sin \: A}  -  \frac{1}{sin \: A} }}  \\  \\ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \tt{ =  \frac{cot \: A - 1 + cosec \: A}{cot \:A + 1 - cosec \: A } } \\  \\ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:\tt{   =\frac{cot \: A + cosec \: A - 1}{cot \:A - cosec \: A + 1 }  }\\  \\ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:\tt{ =  \frac{cot \: A + cosec \: A -( cosec {}^{2} A - cot {}^{2} A) }{cot \:A - cosec \: A + 1}} \\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:\tt{=  \frac{cosec \: A + cot\: A -[( cosec  \:  A - cot \:  A)( cosec  \:  A  + cot \:  A)] }{cot \:A - cosec \: A + 1}} \\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \tt{=  \frac{(cosec \: A + cot\: A)[1 -  (cosec \: A  -  cot\: A)]}{1 + cot \:A - cosec \: A}}  \\  \\   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:\tt{= \frac{(cosec \: A + cot\: A)(1 -  cosec \: A   +   cot\: A)}{1 + cot \:A - cosec \: A}} \\ \\   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:\tt{= \frac{(cosec \: A + cot\: A)(1 -   +   cot\: A - cosec \: A)}{1 + cot \:A - cosec \: A} }\\  \\   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:\tt{= cosec \: A + cot \: A } \\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:\tt{ =  R.H.S.}  \\  \\  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \underline{ \bf{ \:  \: \: Proved. \:  \:  \: }}

Similar questions