6. change sec ^4θ-sec^2θ in terms of tanθ.
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Answer:
1 + 3tan²θ + tan⁴θ
Step-by-step explanation:
sec⁴θ - sec²θ= (1+tan²θ)² - tan²θ
=1 + 2tan²θ + tan⁴θ - tan²θ
=1 + tan²θ + tan⁴θ
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