36. `left(x^{2}+\frac{1}{x^{2}}\right)\left(x+\frac{1}{x}\right)\left(x^{4}+\frac{1}{x^{4}}\right)\left(x-\frac{1}{x}\right)` का सरलतम रूप है-
(a) 1
(b) `x^{8}-\frac{1}{x^{8}}`
(c) `x^{8}+\frac{1}{x^{8}}`
(d) `x^{16}-\frac{1}{x^{16}}`
2. The kinetic energy of a particle executing SHM will be equal to `\left(\frac{1}{8}\right)^{\text {th }}`of its potential energy when its displacement from the mean position is (where A is the amplitude)
A) `A \sqrt{2}`
B) `\frac{A}{2}`
C) `\frac{2 \sqrt{2} A }{3}`
D) `A \sqrt{\frac{2}{3}}`
3. A wave is represented by `y=0.4 \cos \left(8 t-\frac{x}{4}\right)` where x and y are in metres and t in seconds. The frequency of the wave is
A) `\frac{4}{\pi} s ^{-1}`
B) `\frac{8}{\pi} s ^{-1}`
C) `\frac{5}{\pi} s ^{-1}`
D) `\frac{6}{\pi} s ^{-1}`
