Find the Limit $\lim _ { ( x , y ) \rightarrow ( 0,0 ) } \frac { \sin \left( 9 x ^ { 2 } + 9 y ^ { 2 } \right) } { 2 x ^ { 2 } + 2 y ^ { 2 } }$

question 9

Multiple Choice

Find the limit $\lim _ { ( x , y ) \rightarrow ( 0,0 ) } \frac { \sin \left( 9 x ^ { 2 } + 9 y ^ { 2 } \right) } { 2 x ^ { 2 } + 2 y ^ { 2 } }$ . Hint: If $x = r \cos \theta$ and $y = r \sin \theta$ , then $( x , y ) \rightarrow ( 0,0 )$ if and only if $r \rightarrow 0 ^ { + }$ .

• A) \(\frac { 9 } { 2 }\)
• B) 0
• C) \(\frac { 2 } { 9 }\)
• D) 1

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