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[" 18."[(m+2)sin theta+(2m-1)cos theta=2...

[" 18."[(m+2)sin theta+(2m-1)cos theta=2m+1," if "],[[" (a) "tan theta=(3)/(4)," (b) "tan theta=(4)/(3)],[" (c) "tan theta=(2m)/(m^(2)+1)," (d) None of these "]]]

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