Study Set: Plane Trigonometry

If cos^4 Ø - sin^4 Ø is equal to

A. 2sin^2 ∅-1

C. 2tan^2 ∅-1

D. 2sec^2 ∅-1

B. 2cos^2 ∅-1

B. 2cos^2 ∅-1

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Plane Trigonometry

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