Math homework help

Use half angle identities to find exact value.
Given tan theta = -sqrt 2 / 2 and theta lies in quadrant IV, find cos theta / 2.

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  1. so, go find the appropriate half-angle rule. What do you get?

    Just to get you started, for that θ in QIV,
    sinθ = -1/√2
    cosθ = 1/√2

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    posted by Steve

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