NDA2023MathematicsTrigonometric Ratios & IdentitiesActual
Paragraph: Let be the GM of and ; be the AM of and Question: What is 2 equal to?
Options
- A( - )^2
- B( + )^2
- C( - )^3
- D( - )^2 2
Correct answer
A. ( - )^2
Step-by-step solution
( )^2= ....(i) = + 2 2 =1-2 ^2 =1-2 [ By (i) ]= ^2 + ^2 -2 =( - )^2