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MIAHHHHH:
If sin θ = 21 over 29 , use the Pythagorean Identity to find cos θ. cos θ = ± 8 over 29 cos θ = ± 21 over 20 cos θ = ± 29 over 20 cos θ = ± 20 over 29
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Ultrilliam:
Welcome to QC! It looks like this question has been asked before, here are the URLs, they should help you :) questioncove.com/updates/53eba7bbe4b01789aba457e1 questioncove.com/updates/5751b7f9e4b061baa7b1bf81
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