NDA2018MathematicsTrigonometric Ratios & IdentitiesActual
Suppose A is given. If only one value of ( A 2 ) is possible, then A must be
Options
- AAn odd multiple of 90^
- BA multiple of 90^
- CAn odd multiple of 180^
- DA multiple of 180^
Correct answer
C. An odd multiple of 180^
Step-by-step solution
Given, A 2 has only one value. We know, A =2 ^2 ~A 2 -1 2 ^2 ~A 2 = A +1 ~A 2 = A +1 2 Since, A 2 is single value, A+1 2 =0 A =-1 So, A is an odd multiple of 180^ .