Estimate the range of values of x for which the approximation $e ^ { x } \cos x = 1 + x - \frac { 1 } { 3 } x ^ { 3 }$ is accurate to within 0.001.

Name: Estimate the range of values of x for which the approximation $e ^ { x } \cos x = 1 + x - \frac { 1 } { 3 } x ^ { 3 }$ is accurate to within 0.001.
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The Answer of Estimate the range of values of x for which the approximation $e ^ { x } \cos x = 1 + x - \frac { 1 } { 3 } x ^ { 3 }$ is accurate to within 0.001.

Estimate the Range of Values of X for Which the Approximation