Given that sin(θ)=17/21, and θ is in Quadrant II, what is cos(2θ)?

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answerhappygod
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Given that sin(θ)=17/21, and θ is in Quadrant II, what is cos(2θ)?

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Given that sin(θ)=17/21, and θ is in
Quadrant II, what is cos(2θ)?
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