1+cos(8x)= A.4cos(2x) B.2cos^2(4x) C.4sin(2x) D.2sin^2(4x)

What is the missing step in this proof ?

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

Type the correct answer in each box. use numerals instead of words. if necessary, use / fir the fraction bar(s). the graph represents the piecewise function: h