1) YX≅ZX --------> reason : Given
2) ∠YXW≅∠ZXW -----> reason: WX bisects angle ∠YXZ
3) WX is a common side -------> given
4) Δ WYX ≅ Δ WZX are congruent by SAS
because two sets of corresponding sides are congruent and the included angle is congruent
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