A) 0
B) 1
C) \[\infty \]
D) -1
Correct Answer: A
Solution :
In an isosceles triangle ABC right angled at C \[\angle A=\angle B={{45}^{o}}\] \[\therefore \] \[\angle A-\angle B={{0}^{o}}\] \[\therefore \] \[\tan \,(A-B)=\tan {{0}^{o}}=0\]
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