Solve STPM question in FORM 5

Can you solve this trigonometric equation without Polar form? Hint: The best thing you can do is Quadratic Equation.

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Suggested reading:

1. Complex Plane: Rectangular and Polar Form https://www.onlinemathlearning.com/complex-plane-hsn-cn4.html

2. What is r in polar form? http://www.biology.arizona.edu/biomath/tutorials/Trigonometric/TrigBasics.html

Timestamp:

0:00 Introduction 0:37 Method 1: Solution for SPM students 5:04 Checking for Method 1 6:08 Method 2: Polar Form 12:14 Final answers and Conclusion

Let's do math for fun!