A particle is moving in the velocity of v(t) = < 2sin t, 2cos t, 2 >. Find the unit tangent of the particle's movement. O < 0.71 cos t, 0.71 sin t, 0.71 > < 0.71 cos t, -0.71 sin t, 0.00 > O < 0.71 sin t, 0.71 cos t, 0.00 > < 0.71 sin t, 0.71 cos t, 0.71 >

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