x−1sec2xx^{-1} \sec ^{2} xx−1sec2x
x−2sec2x−1x^{-2} \sec ^{2} x^{-1}x−2sec2x−1
−x−2sec2x-x^{-2} \sec ^{2} x−x−2sec2x
−x−2sec2x−1-x^{-2} \sec ^{2} x^{-1}−x−2sec2x−1