Give an Appropriate Answer $$f ( x , y ) = \frac { e ^ { - x } } { x ^ { 2 } + y ^ { 2 } }$$

question 306

Multiple Choice

Give an appropriate answer.
- $$f ( x , y ) = \frac { e ^ { - x } } { x ^ { 2 } + y ^ { 2 } }$$

• A) \(\frac { \partial f } { \partial x } = - \frac { 2 x e ^ { - x } } { \left( x ^ { 2 } + y ^ { 2 } \right) ^ { 2 } } ; \frac { \partial f } { \partial y } = - \frac { 2 y e ^ { - x } } { \left( x ^ { 2 } + y ^ { 2 } \right) ^ { 2 } }\)
• B) \(\frac { \partial f } { \partial x } = \frac { e ^ { - x } \left( x ^ { 2 } + y ^ { 2 } + 2 x \right) } { \left( x ^ { 2 } + y ^ { 2 } \right) ^ { 2 } } ; \frac { \partial f } { \partial y } = \frac { 2 y e ^ { - x } } { \left( x ^ { 2 } + y ^ { 2 } \right) ^ { 2 } }\)
• C) \(\frac { \partial f } { \partial x } = - \frac { e ^ { - x } \left( x ^ { 2 } + y ^ { 2 } + 2 x \right) } { \left( x ^ { 2 } + y ^ { 2 } \right) ^ { 2 } } ; \frac { \partial f } { \partial y } = - \frac { 2 y e ^ { - x } } { \left( x ^ { 2 } + y ^ { 2 } \right) ^ { 2 } }\)
• D) \(\frac { \partial f } { \partial x } = - \frac { e ^ { - x } \left( x ^ { 2 } + y ^ { 2 } + x \right) } { \left( x ^ { 2 } + y ^ { 2 } \right) ^ { 2 } } ; \frac { \partial f } { \partial y } = - \frac { y e ^ { - x } } { \left( x ^ { 2 } + y ^ { 2 } \right) ^ { 2 } }\)

Recognize the functions and significance of digital security services in e-commerce.

Comprehend the nature and scope of B2B e-commerce.

Identify measures to enhance payment security in e-commerce.

Understand the purpose and function of public key cryptography in secure transactions.

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China

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