Question: Refer to the discussion following Example 3 to develop the double angle identities for sine and cosine by using the matrix transformation f(f(u)) = A(Au),

Refer to the discussion following Example 3 to develop the double angle identities for sine and cosine by using the matrix transformation f(f(u)) = A(Au), where

_ sin | coso, cos t, ay sin a2 sincosnd u

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