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The movement of the crest of a wave is modelled with the equation ht 0.2cos4t 0.3sin5t . Find the maximum height of the wave and the time at which it...

The movement of the crest of a wave is modelled with the equation

ht   0.2cos4t  0.3sin5t . Find the maximum height of the wave and the time at

which it occurs.

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