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4-72.

  1. Use the Fundamental Pythagorean Identity to simplify each trig expression. Homework Help ✎

    1. cos2 θ + sin2 θ

    2. 1 − cos2 θ

    3. 1 − cos2 5

    4. 1 − sin2 β

    5. 1 − sin2 (3δ)

    6. 4 − 4 sin2 (3δ)

cos2(3δ)

Factor out a 4 first.

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