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How do I find the value of p (t)= (-200sin (20π t))×(10cos (20πt))

 Jul 15, 2015

Best Answer 

 #1
avatar+118587 
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$$\\=-2000sin (20\pi t)cos (20\pi t))\\\\
=-1000*2sin (20\pi t)cos (20\pi t))\\\\
=-1000\;sin (40\pi t)\\\\$$

 

It t is an integer than this equals  0

otherwise I think it is fully simplified.    

 Jul 15, 2015
 #1
avatar+118587 
+5
Best Answer

$$\\=-2000sin (20\pi t)cos (20\pi t))\\\\
=-1000*2sin (20\pi t)cos (20\pi t))\\\\
=-1000\;sin (40\pi t)\\\\$$

 

It t is an integer than this equals  0

otherwise I think it is fully simplified.    

Melody Jul 15, 2015

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