Question

plz solve this question ​

Answer 1

angleA=angle B

so,AB=AC (iscosceles triangle property)

$\cos(a) = \frac{ac}{ab} \\ cos(b) = \frac{bc}{ab} \\ = > cos(b) = \frac{ac}{ab} \\ therefore \\ cos(a) = cos(b)$

Answer 2

Answer:

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