NDA2013MathematicsTrigonometric Ratios & IdentitiesActual
What is ^4 ~A - ^4 ~A + ^2 ~A + ^2 ~A equal to?
Options
- A0
- B0
- C2
- D-1
Correct answer
A. 0
Step-by-step solution
aligned & ( ^2 ~A + ^2 ~A ) ( ^2 ~A - ^2 ~A )+ ^2 ~A + ^2 ~A & =- ( ^2 ~A + ^2 ~A )+ ^2 ~A + ^2 ~A =0 . aligned