Question

NEED HELP WITH MATH QUESTION (PIC INSERTED)

Answer 1

@reemii

Answer 2

\((r,\alpha)\) represents the point \((x,y)\) where \(x=r\cos \alpha\) and \(y=r\sin\alpha\). (by definition of polar coordinates)

Answer 3

ah yes, usually \(r\ge 0\), but that might just mean, use \(r=4\) and aferwards multiply it by -1.

Answer 4

you can can change -4 to +4. but this changes the angle by 180º (pi radians)

so
change -4, 7pi/6 to +4, 7pi/6 - 6 pi/6 or
4, pi/6

Answer 5

what if we don't change anything, just let them there and apply reemii formula, the results are same. x = r cos theta = -4 cos 7pi/6 = 2sqrt(3) the same.

Answer 6

thanks for medal, reemii.