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5 years, 6 months ago
answer for this question
5 years, 6 months ago
The answer given is wrong and we have modified it. Thanks
5 years, 6 months ago
As AB=BC, it implies that angle B is the right angle and equals 90 degrees.
Angle A = Angle C = 45 degrees.
Therefore, cos A + cos B = 21 + 0 = 21
So the answer is option B.
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