Sin(a)/tan(a)+cot(a)=cos(a)-cos^3(a )

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

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Are the corresponding angles congruent? explain why or why not.