`c) y = log_{2} (2 - x) + (x + 1)^-2`

      ` = log_{2} (2 - x) + 1/((x+1)^2)`

ĐK : `{(2 - x > 0),(x + 1 \ne 0):}`

`to {(x < 2),(x \ne -1):}`

`to D = (-oo ; 2)`\`{-1}`

`e) y = (x^2 - x - 2)^-3`

      ` = 1/((x^2-x-2)^3)`

ĐK : `x^2 - x - 2 \ne 0 to (x - 2)(x + 1) \ne 0 to {(x \ne 2),(x \ne -1):}`

`to D = R`\`{-1 ; 2}`