document.write( "Question 1143227: What is the minimum value of cos(theta) + 2cos(theta +240) \n" ); document.write( "

Algebra.Com's Answer #764045 by math_helper(2461) $\"\"$ $\"About$

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document.write( "Set dy/dt = 0 to find critical points:\r
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document.write( "dy/dt is zero at t = -90 degrees  (and every +/- 180 degrees added to that)\r
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document.write( "zeros are at  t =  degrees \r
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document.write( " n     t (deg)    y
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document.write( "---   -------    ---
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document.write( " -1     -270     
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document.write( " 0      -90     
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document.write( " 1       90     
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document.write( "The minimum value is  (approx. -1.732051) at t=-90 degrees 
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