HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 159

hp40g+.book Page 5 Friday, December 9, 2005 1:03 AM ACOS ATAN Example ASIN(1) returns 90 (Degrees mode). Arc cosine: cos-1x. Output range is from 0° to 180°, 0 to π, or 0 to 200 grads. Inputs and outputs depend on the current angle format. Also accepts complex numbers. Output will be complex for values outside the normal COS domain of -1 ≤ x ≤ 1 . ACOS(value) Example ACOS(1) returns 0 (Degrees mode). Arc tangent: tan-1x. Output range is from -90° to 90°, 2π/2 to π/2, or -100 to 100 grads. Inputs and outputs depend on the current angle format. Also accepts complex numbers. ATAN(value) Example ATAN(1) returns 45 (Degrees mode). Square. Also accepts complex numbers. value2 Example 182 returns 324 Square root. Also accepts complex numbers. value Example 324 returns 18 Negation. Also accepts complex numbers. -value Example -(1,2) returns (-1,-2) Power (x raised to y). Also accepts complex numbers. value^power Using mathematical functions 13-5