# pre-calc

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

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

• pre-calc -

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 -

find the exact value of (5pie/8)

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