Calculator question. Whats is the minimum window that allows r^2=4cos(2theta) multiple choice A. [0,2pi Question Calculator question. Whats is the minimum window that allows r^2=4cos(2theta) multiple choice A. [0,2pi] B. [0,pi] C. [-2pi,2pi] D [0,pi/2] in progress 0 Math Emery 4 months 2022-01-21T05:06:23+00:00 2022-01-21T05:06:23+00:00 2 Answers 0 views 0

## Answers ( )

Answer:doing this so anicalculus can get brainliest

Step-by-step explanation:Answer:D. [0,pi/2]Step-by-step explanation:when Ф = 0 in radian

r²= 4cos (2(0))

r² = 4 * 1

r² = 4

∴ r = √4 = 2

r = 2.

when Ф = π/2 in radian

r²= 4cos (2(π/2))

r² = 4 * -1

r² = -4

∴ r = 0