Select and write the correct answer from...

Select and write the correct answer from the given alternatives in each of the following:If`cosycos(pi/2-x)-cos(pi/2-y)cosx+sinycos(pi/2-x)+cosxsin(pi/2-y)=0`then`x-y`=

A

`45^@`

B

`-45^@`

C

`60^@`

D

`-60^@`

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