Question

find the rectangular form of the equation r=2cosø
A. x^2+y^2=2y
B.2c^2+y^2=x
C. X^2+Y^2=2
D none of the above

Answer 1

tried by multiplying both sides by "r" yet?

Answer 2

what do you mean ?
like i want to take r=2cosø and multiply it by r

Answer 3

\(\bf r=2cos(\theta)\implies {\color{brown}{ r^2}}=2{\color{brown}{ rcos(\theta)}}\qquad
\begin{array}{llll}
r^2\to x^2+y^2\\
\bf rcos(\theta)\to x
\end{array}\)