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math help please

given cosθ=0.400 and θ in 1st quadrant, find sin θ and tan θ

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Michael J. | Effective High School STEM Tutor & CUNY Math Peer LeaderEffective High School STEM Tutor & CUNY ...
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First, find sinx using the pythagorean identity.
Then, you can find tanx by using the identity 
tanx = sinx / cosx