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Question

If θ is the parameter, then the family of lines represented by
(2cosθ+3sinθ)X+(3cosθ5sinθ)
y - (5cosθ7sinθ) = 0 are concurrent at the point

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Solution

cosθ(2x+3y5)+sinθ(3x5y+7)=0
(2x+3y5)+tanθ(3x5y+7)=0
of from L1+λL2=0, intersection point be P
3×(2x+3y5=0)
2×(3x5y+7=0)
___________________
19y29=0y=2919 x=5y73=14513357=1257
P(419,2919)

1167328_1248431_ans_305650ccc414485992aa20f10e33f680.jpg

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