Question

Prove that 1/√9−√8 − 1/√8−√7 + 1/√7−√6 − 1/√6−√5 + 1/√5−√4 − 1/√4−√3 + 1/√3−√2 − 1/√2−1 = 2
please It's Urgent
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Answer 1

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