sec4 A - tan4 A = 1 + 2 tan2A.
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Answer:
hey
Step-by-step explanation:
l.h.s=(sec2a)2+(tan2a)2
( sec2a+tan2a)(sec2a-tan2a)
(sec2a+tan2a)(1)
(1+tan2a)+tan2a
1+2tan2a=r.h.s
hope it will help u dear...
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