1. $${\varepsilon _{\text{c}}} + 2{\varepsilon _{\text{l}}}$$
  2. $$2{\varepsilon _{\text{c}}} + {\varepsilon _{\text{l}}}$$
  3. $${\varepsilon _{\text{c}}} + \varepsilon _{\text{l}}^2$$
  4. $$\varepsilon _{\text{c}}^2 + {\varepsilon _{\text{l}}}$$
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Answer: Option 2

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