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ContentPolar Equation
Polar EquationBesides the parametric form of a curve representation that using a parameter to locate the coordinates (x,y) of point p on the Cartesian plane as a function of one variable, t called parameter. A polar form can also be used to describe a curve on the Cartesian plane using the polar coordinates (r,θ) with the positive xaxis as the fixed initial line. line joining the origin and point P is the radius, r and angle formed by line OP and the fixed initial line OX is the angle θ. Similar to rectangular coordinate system that y is a function of x, radius r is also a function of angle θ in polar coordinate system,and the polar form of a curve is r=f(θ). Imply Since P has both the polar coordinates (r,θ) with respect to the pole O and the initial line OX and has the Cartesian coordinates (x,y) with respect to the axes of reference OX and OY. the polar equation of the curve with the form r=f(θ) can be obtained by substituting x=r cos θ , and y=r sin θ into the Cartesian equation of the curve after equating the values of Cartesian coordinates and Polar coordinates. Similarly, the Cartesian equation can also be obtained by substituting r=√(x²+y²) and θ=tan⁻¹(y/x) into the Polar equation of the curve after equating the two equation x=r cos θ , and y=r sin θ. Imply Derivative of Polar EquationUnlike parametric equation, Leibniz’s notation is usually adopted to denote the derivative of polar equation as in the rectangular equation. The main difference is polar equation is differentiating the polar equation with respect to θ while rectangular equation is differentiating the rectangular equation with respect to x. Imply Derivative of Cartesian Equation from Polar formSimilar to parametric equation, the derivative of Cartesian equation from polar form can also be obtained from the related polar equations by making use of the rule of function of a function. Imply ©sideway ID: 130700031 Last Updated: 7/17/2013 Revision: 0 Ref: References
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