This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Hey Until — ready when you are.
Step 1: Determine the values of , , and . Given and . Since , we have and . The angle is in the second quadrant, which is consistent with being negative and being positive. Now, calculate the hypotenuse using the Pythagorean theorem:
Step 2: Sketch the diagram (3.1). • Draw a Cartesian plane with the x-axis and y-axis. • Mark the origin . • Plot the point in the second quadrant. • Draw a line segment from the origin to . This represents the hypotenuse . • Drop a perpendicular line from to the x-axis, meeting it at . This forms a right-angled triangle. • Label the horizontal side as , the vertical side as , and the hypotenuse as . • Indicate the angle measured counter-clockwise from the positive x-axis to the line segment . • Indicate the reference angle inside the triangle, between the line segment and the negative x-axis.
Step 3: Determine (3.2.1). Using the values from Step 1: Now, calculate the sum: \sin \alpha + \cos \alpha = \frac{7{13}}
Step 4: Determine the value of (3.2.2). First, find the reference angle using the absolute value of : Since the problem states "without the use of calculator", we express using : As is in the second quadrant (), the relationship between and is: Substitute the expression for : \alpha = 180^\circ - \arctan\left(\frac{12{5}\right)}
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Hey Until — ready when you are. Step 1: Determine the values of x, y, and r.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.