1.

The value of cos y cos ((pi)/(2) - x) - cos ((pi)/(2) - y) cos x + sin y cos ((pi)/(2) - x) + cos x sin ((pi)/(2) - y) iszero if

Answer»

`X = 0`
y = 0
x = y
`n PI + y - (pi)/(4) (n in Z)`

Answer :D


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