Q. Convert the equation to polar form. (Use variables r and θ as needed.)y=6x2
Recalling Coordinate Relationships: We start by recalling the relationships between rectangular coordinates (x,y) and polar coordinates (r,θ): x=rcosθ and y=rsinθ. We will use these to convert the given rectangular equation y=6x2 into polar form.
Substitute into Equation: Substitute x with rcosθ and y with rsinθ into the equation y=6x2 to get rsinθ=6(rcosθ)2.
Simplify the Equation: Simplify the equation by squaring rcosθ to get rsinθ=6r2cos2θ.
Eliminate r Term: Divide both sides of the equation by r to eliminate the r term on the left side, being careful to avoid division by zero. This gives us sinθ=r6rcos2θ.
Use Pythagorean Identity: Recognize that cos2θ can be written as (1−sin2θ) using the Pythagorean identity sin2θ+cos2θ=1. Substitute this into the equation to get sinθ=6r(1−sin2θ).
Distribute 6r: Distribute the 6r on the right side to get sinθ=6r−6rsin2θ.
Rearrange Equation: Rearrange the equation to isolate terms involving r on one side. This gives us 6rsin2θ+sinθ−6r=0.
Correcting Mistake: Notice that we have a quadratic equation in terms of rsinθ. Let's set rsinθ=u, then our equation becomes 6u2+u−6r=0.
Correcting Mistake: Notice that we have a quadratic equation in terms of rsinθ. Let's set rsinθ=u, then our equation becomes 6u2+u−6r=0. Now, we need to solve this quadratic equation for u. However, we realize that we have made a mistake in the previous step. The term sinθ is not multiplied by r, so we cannot simply substitute rsinθ=u. We need to correct this and go back to the step before the substitution.
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