If sin (A + B )=1 and cos(A -B)= frac(sq...

If `sin (A + B )=1 and `cos(A -B)= frac(sqrt3)(2)`, where `A gt B.Find the value of B ?

A

`30^@`

B

`45^@`

C

`60^@`

D

`90^@`

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