tan (A/2)= 1/√3 find cos A
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tan (A/2)=1/root3
tan (A/2)=tan30°
on comparing
A/2=30°
A=60°
cosA=
cos60°=1/2
tan (A/2)=tan30°
on comparing
A/2=30°
A=60°
cosA=
cos60°=1/2
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