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[" 9.Let "P={theta:sin0-cos0=sqrt(2)cos ...

[" 9.Let "P={theta:sin0-cos0=sqrt(2)cos theta}" and "Q={theta:sin theta+cos theta=sqrt(2)sin theta}" be two sets."],[" Then "],[[" (1) "P sub Q" and "Q-P=phi," (2) "Q prop P],[" (3) "PQO," (4) "P=Q]]

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