1.

Assertion (A) : (Costheta+iSintheta)^(10)+(Costheta-iSintheta)^(10)=2cos10thetaReason (R) : (1+costheta+isintheta)^n+(1+costheta-isintheta)^n=2^(n+1)cos^n(theta/2)cos((ntheta)/(2))

Answer»

A) Both A and R are TRUE R is CORRECT explanation to A
B) Both A and R are true but R is not correct explanation to A
C) A is true R is FALSE
D) A is false R is true

Answer :B


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