Question
Tue March 31, 2015 By: Pratyaksha Jha

Prove the identiti :
Cosec to the power 4 A - cosec to the power 2 A = cot to the power 4 A + cot to the power 2 A

Expert Reply
Prasenjit Paul
Wed April 01, 2015
cos e c to the power of 4 A minus cos e c squared A equals c o t to the power of 4 A minus c o t squared A L H S comma cos e c to the power of 4 A minus cos e c squared A equals cos e c squared A left parenthesis cos e c squared A minus 1 right parenthesis equals cos e c squared A. c o t squared A equals left parenthesis 1 plus c o t squared A right parenthesis. c o t squared A equals c o t squared A plus c o t to the power of 4 A equals c o t to the power of 4 A plus c o t squared A equals R H S
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