Question: In the next lesson, you'll see that cos 2A = cos2A - sin2A is an identity. Use this identity and the identities from this lesson

In the next lesson, you'll see that cos 2A = cos2A - sin2A is an identity. Use this identity and the identities from this lesson to prove that
a. cos 2A = 1 - 2 sin2 A
b. cos 2A = 2 cos2 A - 1

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