Simplify square root of (1-cos)(1+cos)/cos^2

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Afunction, f(x), represents the height of a plant x months after being planted. students measure and record the height on a monthly basis. select the appropriate domain for this situation. a. the set of all positive real numbers b. the set of all integers oc. the set of all positive integers od. the set of all real numbers reset next