How do you find the value for cos (cos^-1 (3/4))?

1 Answer
Alan P.
Jun 4, 2015

cos^(-1)(x) or arccos(x) (to avoid confusion as to an interpretation as a possible negative exponent)
color(white)("XXXX")= the angle theta for which cos(theta) = x (basic definition)

Therefore cos(arccos(3/4))
color(white)("XXXX")= cos(the angle theta for which cos(theta) = 3/4 )
color(white)("XXXX")=3/4

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