Question

plz...... help me out guys

Answer 1

ohh here ur ans on attachment..........

Answer 2

Answer:

Step-by-step explanation:we know that the sum of interior angles of a triangle=360^

Also, sinx =cosec(90-x)...(1)

Now sin(b+c/2)=cosec(90-(b+c/2))

Sin(b+c/2)=cosec[180-(b+c)/]

Now a+b+c=180

b+c=180-a

Thus sin(b+c/2)=cosec(180-(180-a)/2)

Sin(b+c/2)=cosec a/2