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A square of side 'a' lies above the x-ax...

A square of side 'a' lies above the x-axis and has one vertex at the origin. The side passing through the origin makes an angle `alpha` (0 < `alpha' < `pi`/4 ) with the positive direction of x-axis. Find the equation of diagonal not passing through the origin ?

A

`y (cos alpha + sin alpha) +x (cos alpha -sin alpha) =a`

B

`y(cos alpha - sin alpha )- x (sin alpha - cos alpha)=a`

C

`y(cos alpha + sin alpha0+ x (sin alpha - cos alpha )=a`

D

`y(cos alpha + sin alpha ) + x (sin alpha + cos alpha )=a`

Text Solution

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The correct Answer is:
A
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