If the tangent and the normal to x^2-y^2...

If the tangent and the normal to `x^2-y^2=4` at a point cut off intercepts `a_1,a_2` on the x-axis respectively & `b_1,b_2` on the y-axis respectively. Then the value of `a_1a_2+b_1b_2` is equal to:

`-1`

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