Question

B 13. i) In A ABC,prove that s (tanB÷2 +tanC÷2) = a cotA÷2
​

Answer 1

Answer:

We know that for a traingle ABC

∠A+∠B+∠C=180

0

∠B+∠C=180

0

−∠A

2

∠B+∠C

=90

0

−

2

∠A

tan(

2

B+C

)=tan(90

0

−

2

A

)

=cot(

2

A

)