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The length of the perpendicular form the...

The length of the perpendicular form the point (b,a) to the line `x/a-y/b =1` is

A

1) `(|ab|)/(sqrt(a^(2)cos ^(2)alpha-b^(2)sin ^(2) alpha))`

B

2) `(|ab|)/(sqrt(a^(2)cos ^(2)alpha+b^(2)sin ^(2) alpha))`

C

3) `(|ab|)/(sqrt(a^(2)sin ^(2)alpha-b^(2)cos ^(2) alpha))`

D

4) `(|ab|)/(sqrt(a^(2)sin ^(2)alpha+b^(2)cos ^(2) alpha))`

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The correct Answer is:
D
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