Solve: sec4 A (1 – sin4 A) – 2 tan2 A = 1

(i) sec⁴ A (1 – sin⁴ A) – 2 tan² A = 1
(ii)

Solution:

(i) sec⁴ A (1 – sin⁴ A) – 2 tan² A = 1
L.H.S = sec⁴ A (1 – sin⁴ A) – 2 tan² A

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