If P + Q + R = 60°, then what is the value of cosQ.cosR.(cosP - sinP) – McqOptions

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1.	If P + Q + R = 60°, then what is the value of cosQ.cosR.(cosP - sinP) + sinQ.sinR.(sinP - cosP)? [where Q = - R]
A.	(1 - √3) /2
B.	(1 + √3) /2
C.	(√3 - 1) /2
D.	(√3 + 1) /2
Answer» B. (1 + √3) /2

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