EXAMPLE 20 Let n be a positive integer such that sin +COS 21 2n then 2 (a) ne [6,8] (b) ne(4,8] (b) ne(4,8) (C) (4,8) fed ne(4,8) 0 d

Let n be a positive integer such that sinpi/(2n)+cospi/(2n)=(sqrt(n))/2dot Then 6lt=nlt=8 (b) 4 ltnle8 c) 4lenle8 d) 4ltnlt8

Let n be a positive integer such that sinpi/(2n)+cospi/(2n)=(sqrt(n))/2dot Then 6lt=nlt=8 (b) 4 ltnle8 c) 4lenle8 d) 4ltnlt8

Let n be a positive integer such that sin (pi/(2n))+cos (pi/(2n))= sqrt(n)/2 then (A) n=6 (B) n=1,2,3,….8 (C) n=5 (D) none of these

Let n be a positive integer such that sin (pi/(2n))+cos (pi/(2n))= sqrt(n)/2 then (A) n=6 (B) n=1,2,3,….8 (C) n=5 (D) none of these

Let n be a positive integer such that (sin pi)/(2n)+(cos pi)/(2n)=(sqrt(n))/(2)* Then 6<=n<=8(b)4

The least positive integer n such that ((2i)/(1+i))^(n) is a positive integer is 16b.8c.4d.2

The least positive integer n such that ((2i)/(1+i))^n is a positive integer is a. 16 b. 8 c. 4 d. 2

If A and B are the points (-3,4) and (3,-4) respectively then the co-ordinates of the point C on AB produced such that AC=3BC are (A) (0,0) (B) (-6,8) (C) (6,-8) (D) (-6,-8)

Let R be a relation on the set N given by R={(a ,\ b): a=b-2,\ b >6}dot Then, (2,\ 4) in R (b) (3,\ 8) in R (c) (6,\ 8) in R (d) (8,\ 7) in R

Let R be a relation on the set N given by R={(a ,\ b): a=b-2,\ b >6}dot Then, (a) (2,\ 4) in R (b) (3,\ 8) in R (c) (6,\ 8) in R (d) (8,\ 7) in R