[3x+y=0?],[" Prove that the lines "2x-3y...

[3x+y=0?],[" Prove that the lines "2x-3y+1=0,x+y=3,2x-3y=2" add "],[" parallelogram."],[" Find the value of "theta" between "0" and "pi" if "x cos theta+y sin theta=2 pi" ."]

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