

MCQOPTIONS
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1. |
If \[\frac{1}{x}+x=2\cos \theta ,\] then \[{{x}^{n}}+\frac{1}{{{x}^{n}}}\] is equal to [UPSEAT 2001] |
A. | \[2\cos n\theta \] |
B. | \[2\sin n\theta \] |
C. | \[\cos n\,\theta \] |
D. | \[\sin \,n\theta \] |
Answer» B. \[2\sin n\theta \] | |