If x , y ,z in [-1,1] such that cos^(-1)...

If `x , y ,z in [-1,1]` such that `cos^(-1)x+cos^1y+cos^(-1)z=3pi,` then find the values of (1). `x y+y z+z y` and (2).`x(y+z)+y(z+x)+z(x+y)`

A

-3

B

0

C

3

D

-1

Verified by Experts

The correct Answer is:

C

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