memo2159 memo2159 17-05-2020 Mathematics contestada Which of the following is not an identity? O A. 2cos2x-1 = 1 - 2sin2x O B. secx cscx(tanx + cotx) = sec2x + csc2x O C. 2sin?x- sinx = 1 D. sin2x + tan2x + cos2x = secax