Line x=0 and y+√3x=0 are making angles θ with x+y+√3(y-x)=a then θ can be

• 15 degree
• 22.5 degree
• 67.5 degree
• 75 degree

The angle between the straight lines can be calculated using the formula. The complication you can face is if you don’t get the exact answer in which case you can calibrate and estimate the value of tan(if tanx>1; x>45; …..) and you can reach your answer using sum angle formula for the options also.