1.

A :cos 24^(@) cos 48^(@) cos 96^@ cos 168^(@) = 1//16 R : cos xcos 2 x cos 4x ........ cos (2^n x)=( sin (2^(n+1)x))/(2^(n+1) sin x )

Answer»

A is true , R is true and R is correct EXPLANATION of A
A is true , R is TRUEAND R is not correct explanation of A
A is true , R is false
A is false , R is true

Answer :A


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