math pre-calc help please?

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slsmith118

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i can't figure out these three math problems please help


Give exact answers for 0 ≤ θ ≤ π/2.
If cos(θ) = 1/8
then
tan(θ)?



Give exact answers for 0 ≤ θ ≤ π/2.
If sin(θ) = 1/4
what is sec(θ)? tan(θ)?



cos(α) = −(radical)8/9
and α is in the third quadrant. Find exact values for sin(α) and tan(α).
 
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