Question

provesec⁴A-tan⁴A=1+2tan²A​

Answer 1

$step \: by \: step \: explantion$

sec⁴A- tan⁴a=1+2tan²a

LHS:- (sec²A+tan²A)( sec²A- tan²A)

(1+tan²A+tan²A)(1 )

1+2tan²A=RHS

$hence \: proved$

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