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The following are all angle measures (in degrees, rounded to the nearest tenth) whose tangent is -44 .
Which is the principal value of 
tan^(-1)(-44) ?
Choose 1 answer:
(A) 
-448.7^(@)
(B) 
-268.7^(@)
(c) 
-88.7^(@)
(D) 
91.3^(@)

The following are all angle measures (in degrees, rounded to the nearest tenth) whose tangent is 44-44 .\newlineWhich is the principal value of tan1(44) \tan ^{-1}(-44) ?\newlineChoose 11 answer:\newline(A) 448.7 -448.7^{\circ} \newline(B) 268.7 -268.7^{\circ} \newline(C) 88.7 -88.7^{\circ} \newline(D) 91.3 91.3^{\circ}

Full solution

Q. The following are all angle measures (in degrees, rounded to the nearest tenth) whose tangent is 44-44 .\newlineWhich is the principal value of tan1(44) \tan ^{-1}(-44) ?\newlineChoose 11 answer:\newline(A) 448.7 -448.7^{\circ} \newline(B) 268.7 -268.7^{\circ} \newline(C) 88.7 -88.7^{\circ} \newline(D) 91.3 91.3^{\circ}
  1. Finding the Inverse Tangent Function: The principal value of an inverse tangent function, tan1(x)\tan^{-1}(x), is the value of θ\theta in the range -90° < \theta < 90° that satisfies tan(θ)=x\tan(\theta) = x. Since we are looking for tan1(44)\tan^{-1}(-44), we need to find the angle whose tangent is 44-44 and lies within the specified range.
  2. Using a Calculator or Computer: To find the principal value of tan1(44)\tan^{-1}(-44), we can use a calculator or a computer to compute the inverse tangent of 44-44. Remember that the calculator should be set to degree mode since the answers are given in degrees.
  3. Calculating the Principal Value: Upon calculation, tan1(44)\tan^{-1}(-44) gives an angle of approximately 88.7-88.7 degrees. This falls within the principal range of -90° < \theta < 90°.
  4. Determining the Final Answer: Therefore, the principal value of tan1(44)\tan^{-1}(-44) is 88.7-88.7 degrees, which corresponds to option (C)(C).

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