Question

sin square@- cos square@=​

Answer 1

Answer:

The two identities labeled a') -- "a-prime" -- are simply different versions of a). The first shows how we can express sin θ in terms of cos θ; the second shows how we can express cos θ in terms of sin θ. Note: sin2θ -- "sine squared theta" -- means (sin θ)2.

Step-by-step explanation:

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Answer 2

Answer:

(sin a + cos a)(sina-cosa)

or cos2theta