F cosa, cosß, cosy are the direction cosines of any line, then sinfa + sin-ß + siny =? (b) 3 (a) 4 (c) 2 (d) 1 o a o b o c od 3. point the ines having drs as a,

f cosa, cosß, cosy are the direction cosines of any line, then sinfa + sin-ß + siny =? (b) 3 (a) 4 (C) 2 (d) 1 O a O b O C Od 3. point The ines having drs as a,a2 + b1ba + Ca 0 are (a) coincident C) perpendicular (b) skew (d) parallel