I don't know the answer sorry
A form of passive transport in which the cell membrane surrounds a particle
Answer:
a) ![x=a\cdot cos(b), y=-a\cdot sin(b), 0 \leq b \leq 2\pi](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29%2C%20y%3D-a%5Ccdot%20sin%28b%29%2C%200%20%5Cleq%20b%20%5Cleq%202%5Cpi)
b) ![x=a\cdot cos(b), y=a\cdot sin(b), 0 \leq b \leq 2\pi](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29%2C%20y%3Da%5Ccdot%20sin%28b%29%2C%200%20%5Cleq%20b%20%5Cleq%202%5Cpi)
c) ![x=a\cdot cos(b), y=-a\cdot sin(b), 0 \leq b \leq 6\pi](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29%2C%20y%3D-a%5Ccdot%20sin%28b%29%2C%200%20%5Cleq%20b%20%5Cleq%206%5Cpi)
d) ![x=a\cdot cos(b), y=a\cdot sin(b), 0 \leq b \leq 6\pi](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29%2C%20y%3Da%5Ccdot%20sin%28b%29%2C%200%20%5Cleq%20b%20%5Cleq%206%5Cpi)
Step-by-step explanation:
The parametric equation for a circle is:
![x=a\cdot cos(b)](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29)
![y=a\cdot sin(b)](https://tex.z-dn.net/?f=y%3Da%5Ccdot%20sin%28b%29)
Where a is the radius and b is the angular displacement.
a) If a is negative in y and 0 ≤ b ≤ 2π, we have clockwise moves.
![x=a\cdot cos(b), y=-a\cdot sin(b), 0 \leq b \leq 2\pi](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29%2C%20y%3D-a%5Ccdot%20sin%28b%29%2C%200%20%5Cleq%20b%20%5Cleq%202%5Cpi)
b) If a is positive in y and 0 ≤ b ≤ 2π, we have counterclockwise moves.
![x=a\cdot cos(b), y=a\cdot sin(b), 0 \leq b \leq 2\pi](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29%2C%20y%3Da%5Ccdot%20sin%28b%29%2C%200%20%5Cleq%20b%20%5Cleq%202%5Cpi)
c) If a is negative in y and 0 ≤ b ≤ 6π, we have three times clockwise moves.
![x=a\cdot cos(b), y=-a\cdot sin(b), 0 \leq b \leq 6\pi](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29%2C%20y%3D-a%5Ccdot%20sin%28b%29%2C%200%20%5Cleq%20b%20%5Cleq%206%5Cpi)
d) If a is positive in y and 0 ≤ b ≤ 6π, we have three times counterclockwise moves.
![x=a\cdot cos(b), y=a\cdot sin(b), 0 \leq b \leq 6\pi](https://tex.z-dn.net/?f=x%3Da%5Ccdot%20cos%28b%29%2C%20y%3Da%5Ccdot%20sin%28b%29%2C%200%20%5Cleq%20b%20%5Cleq%206%5Cpi)
Have a nice day!