For \( x = \sin(2t), y = 2 \sin t \) where \( 0 \le t < 2\pi \). Find all values of \( t \) at which a vertical tangent line exists.
parametric-equationsvertical-tangentderivativeschain-ruletrigonometric-equationscalculus-iicurve-sketchingtangent-linessinecosinefind-tangent
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