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1 = sec²θ - tan²θ sustituyendo
(secθ² - tan²θ - tan²θ )² = sec⁴θ -4tan²θ
(secθ² - 2 tan²θ)² =
sec⁴θ - 4 tan²θ sec²θ + 4 tan⁴θ =
sec⁴θ - 4 tan²θ (sec²θ - tan²θ) =
sec⁴θ - 4 tan²θ (1) =
sec⁴θ - 4 tan²θ = sec⁴θ - 4 tan²θ