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If sin x=(12)/(13) "and sin " y= (4)/...

If sin `x=(12)/(13) "and sin " y= (4)/(5) " where " (pi)/(2) lt x lt pi " and " 0 lt y lt .(pi)/(2) ` find the values of
`(i) " sin " (x+y) " "(ii) " cos " (x+y) " "(iii) " tan " (x-y)`

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