If `cos^(-1)lambda+cos^(-1)mu+cos^(-1)gamma=3pi,`then find the value of `lambdamu+mugamma+gammalambda`

If `cos^(-1)lambda+cos^(-1)mu+cos^(-1)gamma=3pi,`then find the value o

1.	If `cos^(-1)lambda+cos^(-1)mu+cos^(-1)gamma=3pi,`then find the value of `lambdamu+mugamma+gammalambda`
Answer» `cos^(-1)lambda+cos^(-1)mu+cos^(-1)gamma=3pi` `0<=cos^(-1)x<=x` `cos^(-1)lambda=cos^(-1)mu=cos^(-1)gamma=pi` `cos^(-1)lambda=pi` `cospi=lambda=-1` `lambda=mu=gamma=-1` `lambdamu+mulambda+gammalambda=3` `1+1+1=3`.

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