prove that this problem
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first of all we assume

and then , find

with help of formula,

now, got
tanA/2 = a , and tanB/2 = b
now, use formula ,

after putting value of tanA/2 and TanB/2
we get,

now put A , and B value
then, you get

and then , find
with help of formula,
now, got
tanA/2 = a , and tanB/2 = b
now, use formula ,
after putting value of tanA/2 and TanB/2
we get,
now put A , and B value
then, you get
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ANSWER IS IN THE IMAGE
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