Find all functions f, defined and continuous in R, such that
For all (u, v) in R2, f(uv)=uf(v)+vf(u)
Thanks

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given

What is the area of the shaded sector?

Urgent? will give brainliest to the first correct answer what is the area of the figure?