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A : If A+B+C=piandcisA=x,cisB=y,cisC=z, ...

A : If `A+B+C=piandcisA=x,cisB=y,cisC=z`, then xyz=-1
R: `(cisalpha)(cisbeta)=cis(alpha+beta)`

A

Both A and R are true and R is the correct explanation of A

B

Both A and B are true but R is not correct explanation of A

C

A is true but R is false

D

A is false but R is true

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