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Find Any Zeros Of rr On the Interval 0θ<2π0 \leq \theta < 2 \pi

Question 106

Multiple Choice

Find any zeros of rr on the interval 0θ<2π0 \leq \theta < 2 \pi .
r=22cosθr = \sqrt { 2 } - 2 \cos \theta


A) zeros: 3π4,5π4\frac { 3 \pi } { 4 } , \frac { 5 \pi } { 4 }
B) zeros: π4,7π4\frac { \pi } { 4 } , \frac { 7 \pi } { 4 }
C) zeros: π2,7π2\frac { \pi } { 2 } , \frac { 7 \pi } { 2 }
D) zeros: 3π2,5π2\frac { 3 \pi } { 2 } , \frac { 5 \pi } { 2 }
E) zeros: π8,7π8\frac { \pi } { 8 } , \frac { 7 \pi } { 8 }

Correct Answer:

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