Please answer numerical methods questions with explanations... also if answering a question involving code please only use C or C++ thanks!

Practice problems: Consider the function f(x) = cos(x)-z. Write down the Newton method for this equation. Consider the function f(x,y, z) = sin(a2 y2+cos() What is the Newton method for finding f(x, y, z) 0? (Dont invert any matrices here. Just tell me what matrix you would invert)