The tangents to x^2+y^2=a^2 having incli...

The tangents to `x^2+y^2=a^2` having inclinations `alpha` and `beta` intersect at `Pdot` If `cotalphacotbeta=0` , then find the locus of `Pdot`

`x+y=0`

`x-y=0`

`xy=0`

none of these

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