NDA_Math_2025_Q71

Question:

If A2 + B2 +C2 = 0, then what is the value of the following? 1 1 1 cosc os cosc os cosc os CB CA BA

If A2 + B2 +C2 = 0, then what is the value of the following? 1 1 1 cosc os cosc os cosc os CB CA BA

Options:

  • a) -1
  • b) 0
  • c) 1
  • d) 2
  • a) -1
  • b) 0
  • c) 1
  • d) 2

correct answer : b)

Explanation:

\ A2 + B2 + C2 = 0
\ A = B = C = 0

Now,
1
1
1
cosc os
cosc os
cosc os
CB
CA
BA
=
111
111
111

= 0

\ A2 + B2 + C2 = 0
\ A = B = C = 0

Now,
1
1
1
cosc os
cosc os
cosc os
CB
CA
BA
=
111
111
111

= 0

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