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If a chord 4y=3x-48 subtends an angle th...

If a chord 4y=3x-48 subtends an angle `theta` at the vertex of the parabola `y^2=64x` then `tantheta=`

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`y^2=64x`
`y^2=4ax`
`a=16`
(16,0)
`P[at^2,2at]=theta[a/t^2,(-2a)/t]`
`P[16t^2,3at]=theta[16/t^2,-32/t]`
`4*32t=3*16t^2-48`
`t=3,1/3`
...
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