$\mathbf { r } ( t ) = \cos t \mathbf { i } + \sin t \mathbf { j } , 0 \leq t \leq 2 \pi$

question 9

Multiple Choice

$\text { Evaluate } \int _ { C _ { 1 } } y ^ { 3 } d x + \left( 27 x - x ^ { 3 } \right) d y \text {, where } C _ { 1 } \text { is the unit circle given by }$
$\mathbf { r } ( t ) = \cos t \mathbf { i } + \sin t \mathbf { j } , 0 \leq t \leq 2 \pi$

• A) \(\frac { 51 \pi } { 2 }\)
• B) \(\frac { 49 \pi } { 2 }\)
• C) \(\frac { 57 \pi } { 2 }\)
• D) \(\frac { 27 \pi } { 2 }\)
• E) \(\frac { 59 \pi } { 2 }\)

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An organization formed by workers in the same sector or industry to protect their rights and interests.