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1. A function is given f(t) = sin2t + cos2t. Which of the following is true?
(A): f has frequency components at 0 and 1/2p Hz
(B): f has frequency components at 0 and 1/p Hz
(C): f has frequency components at 0, l/2p and 1/p Hz
(D): f has frequency components at 1/2p and 1/p Hz
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