A right triangle has only one 90 degree angle. Both of its other angles have measures greater than 0 and less than 90. Why is it useful to define the tangent of 90 to equal 1 and the tangent of 0 to equal 0. HELP!

The tangent of 90ยบ is 1/0, which is undefined.....so maybe it is useful to define it because it is undefined? I don't really know......