सारणिक का मान क्या है, जहाँ  है?

This question was previously asked in
NDA (Held On: 6 Sep 2020) Maths Previous Year paper
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  1. 0
  2. -2
  3. 4i
  4. -4i

Answer (Detailed Solution Below)

Option 4 : -4i
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संकल्पना:

i= -1 , i= - i, i4 = 1, i6 = - 1 , i= 1 , i= i, i 12 = 1, और i15 = - i

 

गणना:

दी गयी सारणिक  है। 

 चूंकि हमारे पास निम्न है, 

i= -1 , i= - i, i4 = 1, i6 = - 1 , i= 1 , i= i, i 12 = 1, और i15 = - i

=

=i(i - 1) + 1(-i - i) - i (1 + i)

= i- i - 2i - i - i2

= - 4i

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