Hi. First post on forum. Hopefully in proper section. I have a question like this;

The graph shows output model of vibrations of engine, and can be expressed function;

x(t)=(cosπt)(sin20πt)

t194_tma03_17j_q02_f01.eps.jpg

For what values of t in interval 0-1 the amplitude x(t) is zero? Hint; evaluatesin nπfor integer values ofn

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