You can put this solution on YOUR website! Find the exact value of cos(2t)and sin(2t) if tan(t) = (-5/12) and 270° < t < 360°.
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Use tan(θ) = (-5/12) and 270° < θ < 360° to find the sin(t) (in Q4).
Then find the cos(t).
Then find the sin(2t), then the cos(2t).
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I don't need the practice.