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Find the length of the curve 1) x=2sin t+2t, y=2cos t, 0≤t≤pi 2) x=6 cos t,...

Find the length of the curve
1) x=2sin t+2t, y=2cos t, 0≤t≤pi
2) x=6 cos t, y=6 sin t, 0≤t≤pi
3) x=7sin t- 7t cos t, y=7cos t+ 7 t sin t, 0≤t≤pi/4

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