Question

I need its correct answer ​

Answer 1

m∠C = 90°

m∠A = m∠B, i.e., measure of the angles A and B are equal.

m∠A = 45°

m∠B = 45°

Now, sec (A+B)

= sec (45° + 45°)

= sec 90° which is undefined.

In the question it should be mentioned either the measure of ∠A or the measure of ∠B.