please prove 7 one. please give step by step explaination
Attachments:
Answers
Answered by
1
cosec^4A - cosec^2A = cot^4A + cot^2A
=> LHS= (1 + cotA^2)^2 - (1 + cotA^2)
=> 1 + 2cot^2A + cot^4A - ( 1 + cot^2A )
=> 1 + 2cot^2A + cot^4A -1 - cot^2A
=> cot^4 + cot^2
Hence proved !
Similar questions