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Trigonometric equation for stress

  • Thread starter foo9008
  • Start date
  • #1
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4

Homework Statement


is the circled part wrong ?
0bDsABg.jpg

Homework Equations




The Attempt at a Solution


how could 0.5 sin2theta = ( 1 + cos2theta ) / 2 ?
 

Answers and Replies

  • #2
SteamKing
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