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If [ x = cos α + i sin α , y = cos β +...

If `[ x = cos α + i sin α , y = cos β + i sin β ]` then `y/x` − `x/y` =? (A) `2 i sin ( α + β )` (B) `2 i sin ( β − α )` (C) `2 i cos ( α + β )` (D) `2 i cos ( α − β )`

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