A. (-1, 2)

B. (2, -1)

C. (-2, 1)

D. (1, -2)

If the direction ratio of two lines are given by 3lm-4ln+mn =0 and l+2m+3n=0,then the angle between the lines, is

The ascending order of the moduli of the complex numbers z_{1}=1+i,z_{2}=1+2i,z_{3}=1-i/√2,z_{4}=3+4i is

The period of the function tan(3x+5) is:

I: The modulus of √3+i/(1+i)(1+√3i) is 1/√2

II: The least positive value of n for which (1-i/1+i)^{n}=1 is 2

If 1,ω,ω^{2} are the cube roots of unity, then (a+bω+cω^{2})/ (c+aω+bω^{2}) is equal to: