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If P+Q+R=60^(@),then what is the value o...

If `P+Q+R=60^(@)`,then what is the value of cos Q cos R (cosP-sinP)+sinQsinR(sinP-cosP)?

A

`(1)/(2)`

B

`(1-sqrt(3))/(2)`

C

`(1)/(sqrt(2))`

D

`sqrt(2)`

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