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Solution:
Explanation: Use one of the Pythagorean identity namely,
sec2A=1+tan2A
LHS = sec4A−sec2A
=(sec2A)2−sec2A
=(1+tan2A)2−(1+tan2A)
=1+2tan2A+tan4A−1−tan2A
=tan4A+tan2A
= RHS
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