Help im on a meeting this need to be done

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

What is the multiple zero and multiplicity of f(x) = (x ? 3)(x ? 3)(x + 5)? multiple zero is 3; multiplicity is 2 multiple zero is 5; multiplicity is 1 multiple zero is ? 5; multiplicity is 1 multiple zero is ? 3; multiplicity is 2

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees