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sin-1 ( x . root (1-x) - root(x).root(1-x^2) )

pls answer , I have a test tomorrow :/

then it will be

sin^-1 (sin a root (1- sin^2b) - sin b root (1-sin^2a) )

sin^-1 (sina cosb -sinb cos a)

sin^-1 (sin (a-b))

a - b

sin^-1x - sin^1rootx