trig

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inverse tan x = inverse cos 4/5

  • trig -

    inverse cos 4/5
    = cos^-1 (4/5)
    = .6435..
    then tan^-1 x = .6435...
    x = tan .6435...
    = .75

    or, make a diagram with sides 3-4-5
    then, if tan^-1 x = cos^-1 (4/5)
    then x = tan (cos^-1(4/5) )
    = 3/4 or .75

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