Ice2zoey1Chard
Ice2zoey1Chard Ice2zoey1Chard
  • 15-06-2016
  • Mathematics
contestada

Evaluate
a) sin (4pi/3)
b) cos (5pi/6)

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padawan
padawan padawan
  • 15-06-2016
sin(pi + a) = -sin(a)
sin(4pi/3) = sin(pi + pi/3) = -sin(pi/3)

cos(pi-a) = -cos(a)
cos(5pi/6) = cos(pi -pi/6) = -cos(pi/6)
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HomertheGenius
HomertheGenius HomertheGenius
  • 21-06-2016
a) sin ( 4π/3 ) = sin 240° = sin ( 180° + 60°) = - sin 60° = [tex]- \frac{ \sqrt{3} }{2} [/tex]

b) cos (5π/6 ) = cos 150° = cos ( 90° + 60° ) = - sin 60°=[tex]- \frac{ \sqrt{3} }{2} [/tex]
 
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