$${e^{ - \left( {1 + i} \right)x}},{e^{ - \left( {1 - i} \right)x}}$$

$${e^{\left( {1 + i} \right)x}},\,\,{e^{\left( {1 - i} \right)x}}$$

$${e^{ - \left( {1 + i} \right)x}},\,\,{e^{\left( {1 + i} \right)x}}$$

$${e^{\left( {1 + i} \right)x}},\,\,{e^{ - \left( {1 + i} \right)x}}$$

$$1 - 2i$$

$$1 + 2i$$

$$2 - i$$

$$2 + i$$

$$\left[ {\matrix{ 2 \cr 1 \cr } } \right]\left[ {\matrix{ 1 \cr { - 2} \cr } } \right]$$

$$\left[ {\matrix{ 2 \cr 1 \cr } } \right]\left[ {\matrix{ 1 \cr 2 \cr } } \right]$$

$$\left[ {\matrix{ { - 2} \cr 1 \cr } } \right]\left[ {\matrix{ 1 \cr { - 2} \cr } } \right]$$

$$\left[ {\matrix{ { - 2} \cr 1 \cr } } \right]\left[ {\matrix{ 1 \cr 2 \cr } } \right]$$

$${8 \over {{s^4}}}$$

$${{16} \over {{s^4}}}$$

$${{24} \over {{s^4}}}$$

$${{48} \over {{s^4}}}$$