Solved

Evaluate the Integral $\int _ { 0 } ^ { 1 / 2 } \frac { 4 d r } { \sqrt { 1 - r ^ { 2 } } }$

Question 9

Multiple Choice

Evaluate the integral. $\int _ { 0 } ^ { 1 / 2 } \frac { 4 d r } { \sqrt { 1 - r ^ { 2 } } }$

A) $\frac { \pi } { 4 }$
B) $\frac { 1 } { 5 }$
C) $\frac { \pi } { 5 }$
D) $\frac { 1 } { 4 }$
E) $\frac { 2 \pi } { 3 }$

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