Asked by VesaN
cosx-sinx<1/2
Answers
Answered by
bobpursley
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.
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.
Answered by
VesaN
thnx
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