INVERSE TRIGONOMETRIC FUNCTIONS
INVERSE TRIGONOMETRIC FUNCTIONS(a.k.a. arcsin, arccos and arctan)If we restrict the function f(x) = sinx so that its domain is the closed interval , this function has an inverse. This inverse sine function is denoted by f-1(x) = sin-1x or arcsinx. For example, if sin 30o = 0.5, the inverse function would be to find the angle that has a sine of 0.5, sin-1 (0.5) = 30o057912000y = sin-1x = arcsinx if and only if (iff) siny = x for and .39014401752600019735802540000 y = arcsinxy = arccosx y = arctanxWARNING: the -1 appearing in the notation f-1(x) = sin-1x is NOT an exponent. It denotes the inverse function. It does NOT mean (sin x)-1 = (which is the reciprocal of sin x and is equal to csc x). The restricted cosine function is the function g(x) = cos x whose domain is the closed interval . The inverse cosine function is denoted by g-1(x) = cos-1 x or arccos x. Thus, y = cos-1x iff cos y = x for and .Examples: cos-1() = since cos = Sin -1(-1) = since sin= -1 ................
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