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If cos(x)=1/6 and x is in quadrant I, determine the exact value of each of the...

If cos(x)=1/6 and x is in quadrant I, determine the exact value of each of the following. Use fractions and radicals only, no decimals.

a. sin(x/2)=

b. cos(x/2)=

c. tan(x/2)=

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