1.

व (तो =920 ¢ Atv M e o ¥ A orLQ + C=(e)८नमन

Answer»

tan {(B+C)/2}= tan A/2= tan 90°/2= tan 45°= 1

since A+B+C=180°

a+b+c/2=180/2 {because abc is a triangle sum of angles of a triangle is 180°}

a/2+b+c/2=90. b+c/2=90-a/2

taking tan on both sides

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

tan b+c/2=cot a/2


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