Question

find a
please help to get the value of a because it is very difficult sum

Answer 1

Inside the root, add  $ax$-$a^{2}$ and subtract.

Then you will get it in form  ∫$\frac{1}\sqrt{ {a^{2} -x^{2}} }$dx

Use formula and get it

Answer 2

Answer:

Hope it helps,

plz marks as brainlist.