[" (A) "bar(sqrt(b^(2)-a^(2)))quad " (B)...

[" (A) "bar(sqrt(b^(2)-a^(2)))quad " (B) "quad (b)/(a)quad " (C) "(V)/(b)],[" 5.If "cos(alpha+beta)=0" ,then "sin(alpha-beta)" can be reduced to "],[[" (A) "cos beta," (B) "cos2 beta," (C) "sin alpha," (D) "sin2 alpha]]

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