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An approximation error is the discrepancy between an exact value and the approximation to it. This occurs when the measurement of something is not precise.
The exact value of sin 22.5 is 0.382683432
3, -3 4, -4 these numbers all have the same "exact value" 3, -5 do not have the same exact value. exact value is how many s[pots away from 0 it is
The exact value is 0.40673664.
Trigonometric functions are calculated using a polynomial approximation. The exact polynomial used may be different on different calculators.