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Sagot :
Step-by-step explanation:
- a+b+c=0
- b+c=(-a) (SQUARING both the sides)
- (b+c)²=(-a)²
- (b²+c²+2bc)=a²
- 2bc=a²-b²-c²
HENCE PROVED
a²-b²-c²=2bc
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