equation trig

cosx-sinx<1/2

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  1. square both sides

    cos^2 -2sin*cos + sin^2<1/4
    1-sin(2x)<1/4
    sin(2x)<-3/4
    2x>131deg
    x>65.5 deg
    2x<311
    x<155 check that with a graph.

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    bobpursley
  2. thnx

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