1.

Statement-1 : cos.(pi)/(7)cos.(2pi)/(7)cos.(4pi)/(7)=-(1)/(8) Statement-2 : costhetacos2thetacos2^(2)thetaunderset(cos2^(n-1)theta)(............)=-(1)/(2^(n))" if "theta=(pi)/(2^(n)-1)

Answer»

Statement-1 is TRUE, statement-2 is true, statement-2 is a CORRECT EXPLANATION for statement-1
Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1
Statement-1 is true, statement-2 is FALSE
Statement-1 is false, statement-2 is true

Answer :A


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