Question #c2612

1 Answer
Jim G.
Dec 30, 2017

#cosx=-(2sqrt6)/5#

Explanation:

#cscx=1/sinx=-5rArrsinx=-1/5#

#sinx<0" and "tanx>0#

#rArr"third quadrant where cos is negative"#

#cosx=-sqrt(1-sin^2x)#

#color(white)(cosx)=-sqrt(1-(-1/5)^2)=-sqrt(24/25)=-(2sqrt6)/5#

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