The functions {{MATH_121}} are called ``arc'' because they give the angle that cosine or sine used to produce their value. It is quite common to write {{MATH_122}} However, this notation is misleading as {{MATH_123}} and {{MATH_124}} are not true inverse functions of cosine and sine. Recall that a function and its inverse undo each other in either order, for example, {{MATH_125}} Since arcsine is the inverse of sine restricted to the interval {{MATH_126}}, this does not work with sine and arcsine, for example {{MATH_127}} though it is true that {{MATH_128}} {{CMD_129}} Which of the following statements is true? {{CMD_130}} {{CMD_131}}{{MATH_132}} is the inverse function of {{MATH_133}}{{CMD_134}} {{COMMENT_135}} {{CMD_136}}{{MATH_137}}{{CMD_138}} {{CMD_139}}{{MATH_140}}{{CMD_141}} {{CMD_142}}{{MATH_143}}{{CMD_144}} {{CMD_145}} {{CMD_146}}