Precalculus
±sec2x−1\(\pm\)\(\sqrt{\sec^2x-1}\)
±1−sec2x\(\pm\)\(\sqrt{1-\sec^2x}\)
±sec2x+1\(\pm\)\(\sqrt{\sec^2x+1}\)
±2sec2x−1\(\pm\)\(\sqrt{2\sec^2x-1}\)