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The following are all angle measures (in degrees, rounded to the nearest tenth) whose tangent is 2.6.
Which is the principal value of 
arctan(2.6) ?
Choose 1 answer:
(A) 
-111.0^(@)
(B) 
69.0^(@)
(c) 
249.0^(@)
(D) 
429.0^(@)

The following are all angle measures (in degrees, rounded to the nearest tenth) whose tangent is 22.66 .\newlineWhich is the principal value of arctan(2.6) \arctan (2.6) ?\newlineChoose 11 answer:\newline(A) 111.0 -111.0^{\circ} \newline(B) 69.0 69.0^{\circ} \newline(C) 249.0 249.0^{\circ} \newline(D) 429.0 429.0^{\circ}

Full solution

Q. The following are all angle measures (in degrees, rounded to the nearest tenth) whose tangent is 22.66 .\newlineWhich is the principal value of arctan(2.6) \arctan (2.6) ?\newlineChoose 11 answer:\newline(A) 111.0 -111.0^{\circ} \newline(B) 69.0 69.0^{\circ} \newline(C) 249.0 249.0^{\circ} \newline(D) 429.0 429.0^{\circ}
  1. Definition of arctan function: The principal value of the arctan function is the value of the angle in the range of 90-90 degrees to 9090 degrees that corresponds to a given tangent value.
  2. Calculate arctan(2.6)\arctan(2.6): Calculate the principal value of arctan(2.6)\arctan(2.6) using a calculator or trigonometric tables to find the angle whose tangent is 2.62.6.\newlinePrincipal value of arctan(2.6)\arctan(2.6) 69.0\approx 69.0 degrees (rounded to the nearest tenth).
  3. Check given options: Check the given options to find the one that matches the calculated principal value.\newline(A) 111.0-111.0 degrees is not in the range of 90-90 to 9090 degrees.\newline(B) 69.069.0 degrees is in the range of 90-90 to 9090 degrees and matches our calculated value.\newline(C) 249.0249.0 degrees is not in the range of 90-90 to 9090 degrees.\newline(D) 429.0429.0 degrees is not in the range of 90-90 to 9090 degrees.
  4. Select correct answer: Select the correct answer based on the principal value range and the calculated value.\newlineThe correct answer is (B) 69.069.0 degrees.

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