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[cos((pi)/(4)+A)cos((pi)/(4)-B)-sin((pi)...

[cos((pi)/(4)+A)cos((pi)/(4)-B)-sin((pi)/(4)+A)sin((pi)/(4)-B)=],[" 1) "cos(A+B)quad " 2) "cos(A-B)],[" 3) "sin(A+B)quad " 4) "sin(B-A)]

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