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

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

A

a) `1//2`

B

b) `sqrt 3//sqrt2`

C

c) `1//sqrt2`

D

d) `(1-sqrt3`)/2

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