length of the curve,
"L=\\int_{t_1}^{t_2}\\sqrt{(\\frac{dx}{dt})^2+(\\frac{dy}{dt})^2}dt"
by using above formula, we get
"L=\\int_{t_1}^{t_2}\\sqrt{(1)^2+(0)^2}dt\\\\\n=\\int_{t_1}^{t_2}dt\\\\\n=t_2-t_1"
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