4. Show by defintion that f:R R, f(z) = cos(z), is continuous on R. Hint: you may need to mimick the proof of conitinuity of f(x)= sin(z) on R

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Linear Algebra

In mathematics, problems can be solved by the arithmetic operators like addition, subtraction, multiplication, and division. In algebra, we represent the numbers by any letter called a variable. If these variables are of degree 1, then it is studied under linear algebra. The first-degree equations involving algebraic expressions are called linear equations. That is, if you represent it by drawing a graph you will get a straight line.