0 votes 0 votes The equations $x=a \cos \theta + b \sin \theta$ and $y=a \sin \theta + b \cos \theta$, $( 0 \leq \theta \leq 2 \pi$ and $a,b$ are arbitrary constants) represent a circle a parabola an ellipse a hyperbola Quantitative Aptitude isi2015-dcg quantitative-aptitude trigonometry geometry + – gatecse asked Sep 18, 2019 • retagged Nov 14, 2019 by Lakshman Bhaiya gatecse 722 views answer comment Share Follow See all 13 Comments See all 13 13 Comments reply Show 10 previous comments ankitgupta.1729 commented Oct 1, 2019 reply Follow Share I don't think, we can replace $\theta$ here 1 votes 1 votes `JEET commented Oct 1, 2019 reply Follow Share I am feeling the same as well. I hope the question is correct then. 2 votes 2 votes `JEET commented Nov 14, 2019 reply Follow Share @gatecse Please check this question once. Is it typed correctly? 0 votes 0 votes Please log in or register to add a comment.