Posted by **Kim** on Sunday, April 22, 2012 at 6:19pm.

find the exact value of the given expression. Thank you!

tan(1/2cos^-1(9/10)

- pre-calc -
**bobpursley**, Sunday, April 22, 2012 at 7:09pm
tangent of 1/2 the angle whose cosine is 9/10

Exact value? What is wrong with a calculator? Paste this into your google search window...

tan(.5*arccos(9/10))=

Is that exact enough? It appears to be an irrational number.

- pre-calc -
**kristina**, Tuesday, May 1, 2012 at 2:20pm
find the exact value of (5pie/8)

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