Practice problem
Which of these is equivalent to the triangle inequality?
−∣b−a∣≤∣b∣+∣a∣-|b-a|\leq|b|+|a|−∣b−a∣≤∣b∣+∣a∣
∣b−a∣≤∣b∣−∣a∣|b-a|\leq|b|-|a|∣b−a∣≤∣b∣−∣a∣
∣b+a∣≤∣b∣+∣a∣|b+a|\leq|b|+|a|∣b+a∣≤∣b∣+∣a∣
Type a concept, like “slope” or “photosynthesis”.