Question

if a b and c are interior angles of a triangle abc then find tan(b+c/2)

Answer 1

hiHi☺☺

a, b, c are interior angles of triangle,

•°• a+b+c = 180°

b+c = 180°-a

Dividing both side by 2

we get,

(b+c)/2 = 90°-(a/2)

=> tan{(b+c)/2} = tan (90-a/2)

°•° tan(90-x) = cotx

•°• tan{(b+c)/2} = cot(a/2) .

☺☺

Answer 2

Answer:

I hope it is helpful........................