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January 28, 2015

January 28, 2015

Posted by **makaela** on Wednesday, May 16, 2012 at 9:35pm.

- trig -
**Reiny**, Wednesday, May 16, 2012 at 10:36pminverse 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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