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vec(u)=(7,-4)
Find the direction angle of vec(u).
Enter your answer as an angle in degrees between 0^(@) and 360^(@) rounded to the nearest hundredth.
theta=◻degree

u=(7,4) \vec{u}=(7,-4) \newlineFind the direction angle of u \vec{u} .\newlineEnter your answer as an angle in degrees between 0 0^{\circ} and 360 360^{\circ} rounded to the nearest hundredth.\newlineθ=° \theta= \square \degree \newline

Full solution

Q. u=(7,4) \vec{u}=(7,-4) \newlineFind the direction angle of u \vec{u} .\newlineEnter your answer as an angle in degrees between 0 0^{\circ} and 360 360^{\circ} rounded to the nearest hundredth.\newlineθ=° \theta= \square \degree \newline
  1. Calculate Tangent: To find the direction angle of the vector u=(7,4)\vec{u} = (7, -4), we need to calculate the angle θ\theta that the vector makes with the positive x-axis. The direction angle can be found using the arctangent function (tan1)(\tan^{-1}), which gives us the angle whose tangent is the ratio of the y-coordinate to the x-coordinate of the vector.
  2. Use Arctangent Function: Calculate the tangent of the angle θ\theta using the y-coordinate and the x-coordinate of u\vec{u}: tan(θ)=47\tan(\theta) = \frac{-4}{7}.
  3. Perform Calculation: Use the arctangent function to find the angle θ\theta: θ=tan1(47)\theta = \tan^{-1}\left(\frac{-4}{7}\right). Make sure to use a calculator set to degree mode for this calculation.
  4. Add 360360 Degrees: Perform the calculation: θ=tan1(4/7)29.74\theta = \tan^{-1}(-4 / 7) \approx -29.74^\circ. This is the angle that u\vec{u} makes with the positive x-axis, measured counterclockwise. However, since the angle is negative, it is measured clockwise from the positive x-axis.
  5. Round Direction Angle: To find the direction angle between 00^\circ and 360360^\circ, we add 360360^\circ to the negative angle: θ=29.74+360330.26\theta = -29.74^\circ + 360^\circ \approx 330.26^\circ.
  6. Round Direction Angle: To find the direction angle between 00^\circ and 360360^\circ, we add 360360^\circ to the negative angle: θ=29.74+360330.26\theta = -29.74^\circ + 360^\circ \approx 330.26^\circ.Round the direction angle to the nearest hundredth: θ330.26\theta \approx 330.26^\circ.

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