NDA_Math_2025_Q73

Question:

What is 3 3 3 i i equal to?

What is 3 3 3 i i equal to?

Options:

  • a) -1
  • b) 0
  • c) 1
  • d) 3
  • a) -1
  • b) 0
  • c) 1
  • d) 3

correct answer : a)

Explanation:

3
3
3
+






i
i
= 3
31
2 3
+()
+





i
= 3
2
1
2
6
+


i

= coss inππ
66
6
+
 
i
= cos p + i sin p = -1

3
3
3
+






i
i
= 3
31
2 3
+()
+





i
= 3
2
1
2
6
+


i

= coss inππ
66
6
+
 
i
= cos p + i sin p = -1

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