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If sinA=sinB and cosA=cosB, A pi B, then...

If `sinA=sinB and cosA=cosB, A pi B`, then

A

`"tan"(A-B)/(2)=0`

B

`cos(A+B)=1`

C

`"tan"(A+B)/(2)=0`

D

`sin(A-B)=1//2`

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