The equation of $SHM$ is given as:

$x = 3\,sin\, 20\pi t + 4\, cos\, 20\pi t$ , 

where $x$ is in $cms$ and $t$ is in $seconds$ . The amplitude is  ..... $cm$

  • A$7$
  • B$4$
  • C$5$
  • D$3$
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