The length ofthe chord joining the points `(4 cos theta , 4 sin theta)` and `[4 cos(theta +60^@), 4 sin (theta + 60^@)]` of the circle `x^2+y^2=16` is

The length of the chord joining the points (4 cos theta , 4 sin theta ) and (4 cos ( theta+ 60^@ ), 4 sin ( theta+ 60^@ )) of the circle x^2+y^2=16 is :

The length of the chord joining the points (4 cos theta, 4 sin theta) and (4 cos (theta+60^(2)),4 sin (theta+60^(@))) of the circle x^(2)+y^(2)=16 is

The length of the chord joining the points ( 4cos theta , 4 sin theta ) and [ 4 cos ( theta + 60^(@)), 4 sin ( theta + 60^(@))] of the circle x^(2) +y^(2) =16 is :

The length of the chord joining the points ( 4cos theta , 4 sin theta ) and [ 4 cos ( theta + 60^(@)), 4 sin ( theta + 60^(@))] of the circle x^(2) +y^(2) =16 is :

The length of the chord joining the points (4 cos theta 4 sin theta) and (4 cos (theta+60^@),4 sin (theta+60^@)) of the circle x^2+y^2=16 is :

The length ofthe chord joining the points (4cos theta,4sin theta) and [4cos theta+60^(@)),4sin(theta+60^(@))] of the circle x^(2)+y^(2)=16 is

If sin theta + cos theta = a " then " sin^(4) theta + cos^(4) theta =