MCQ
If $x+i y={ }^` 5 /\left(3+\right.$ costheta + isintheta); , then $x^2+y^2$ is equal to ______
- ✓`25/(10 + 6costheta)`
- B`25/(6 + 10costheta)`
- C`5/(6 - 10costheta)`
- D`5/(10 - 6costheta)`
✓
Answer
Correct option: A.
`25/(10 + 6costheta)`
A
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