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When two displacement represented by y1 ...

When two displacement represented by `y_1 = a sin t (omegat)` and `y_2 = b cos t (omegat)` are superimposed the motion is

A

simple harmonic with amplitude `a/b`

B

simple harmonic with amplitude `sqrt(a^2 + b^2)`

C

simple harmonic with amplitude`(a + b )/2`

D

not a simple harmonic

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