Question

Factor and simplify (cos^2(x)-1)/(cos(x) +1)

Answer 1

Distribute using the FOIL method, then combine like terms.

Answer 2

let x = cosx

than x^2 -1/ x +1

factor x^2 -1 = (x+1)(x+1)/(x+1)

= x-1

so the solution for x = 1

so solve for cosx =1

Answer 3

\[\frac{x^2-1}{x+1}=\frac{(x+1)(x-1)}{x+1}=x-1\]

Answer 4

Thanks