1.

The value of cos ycos((1)/(2)pi-x)-cos((1)/(2)pi-y)cosx+sinycos((1)/(2)pi-x)+cosxsin((1)/(2)pi-y) is zero is

Answer»

`x=0`
`y=0`
`x=y+pi//4`
`x=3pi//4+y`

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