How to find cos(a) if tan (a) = 0.5 and a is in the III quadrant
1 answer:
Answer:
hey
Step-by-step explanation:
tana=5/10
tan a=1/2
I\
1 I \ x
I \
I__a\
2
Let unknown side be x
angle be a
using pythagorus theorem,1²+2²=x²
x²=5
x= √5,-√5
cos a= 2/√5
but a is in quadrant III ,Cos is negative
<h2>cos a= -2/√5</h2>
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