If vectors A-->= cos wt i^ + sin wt j^ and B--> = cos wt /2^i + sin wt/2 j^ are functions of time, then value of t at which they are orthogonal to each other is:
(a) Tn = n find (i) Tn+1 (ii) T n−1
(b) If Tn = n2 − 1 find (i) Tn−2 (ii) Tn+1
(c) If Tn = 2n2 + 1 find the value of n if Tn = 73
(d) In a sequence Tn = 5 − 3n find (i) Tn+1 (ii) Tn+2