Question

a=1/√1+1/√3+1/√5+1/√7...
b=1/√2+1/√4+1/√6+1/√8...
than a+b/a-b=

1)2/2-√2
2)√2/2-√2
3)√2/√2-2
4)2/2+√2​

Answer 1

option 2

please mark me the brainliest please