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NDA2015MathematicsTrigonometric Ratios & IdentitiesActual

(1- A+ A)^2 is equal to

Options

  1. A2(1- A)(1+ A)
  2. B2(1- A)(1+ A)
  3. C2(1- A)(1- A)
  4. DNone of the above

Correct answer

B. 2(1- A)(1+ A)

Step-by-step solution

aligned & (1- A+ A)^2 & =1+ ^2 A+ ^2 A-2 A & -2 A A+2 A aligned aligned & =2-2 A-2 A A+2 A & =2(1- A)+2 A(1- A) & =2(1+ A)(1- A) aligned Option (B) is correct.

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