If the line x cosalpha + y sin alpha = P...

If the line `x cosalpha + y sin alpha = P` touches the curve `4x^3=27ay^2`, then `P/a=`

A

`cot ^(2) alpha cos alpha `

B

` cot ^(2) alpha sin alpha `

C

`tna ^(2) alpha cos alpha `

D

` tan ^(2) alpha sin alpha `

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The correct Answer is:

A

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