Trigonometry
Geometry
Level
1
If sec x=13/5,x lies in 4th quadrant,then cos x in 2nd quadrant is
13/5
-13/5
-5/13
5/13
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1 solution
secx=1/cosx means inverse of cos x,then cos x=5/13,and one more condition is given that cos x lies in 2nd quadrant then we know in 2nd quadrant only sin and cosine are positive therefore cos x=-5/13