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Using the identity $ \sin ^{2} \theta+\cos ^{2} \theta=1 $, find the value of $ \cos \theta $, to the nearest hundredth, if $ \sin \theta=-0.4 $ and $ \pi

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Using the identity $ \sin ^{2} \theta+\cos ^{2} \theta=1 $, find the value of $ \cos \theta $, to the nearest hundredth, if $ \sin \theta=-0.4 $ and $ \pi<\theta<\frac{3 \pi}{2} $.
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