If x(t)=3cos2t and y(t)=−3sint, eliminate the parameter to write the parametric equations as a Cartesian equation.Select the correct answer below:(A) y2=9−3x(B) x2=9−3y(C) 9x2+9y2=1(D) 3x−3y=1
Q. If x(t)=3cos2t and y(t)=−3sint, eliminate the parameter to write the parametric equations as a Cartesian equation.Select the correct answer below:(A) y2=9−3x(B) x2=9−3y(C) 9x2+9y2=1(D) 3x−3y=1
Given Equations: Given the parametric equations:x(t)=3cos2(t)y(t)=−3sin(t)We want to eliminate the parameter t to find a Cartesian equation that relates x and y.
Pythagorean Identity: We know that sin2(t)+cos2(t)=1 from the Pythagorean identity.
Expressing cos2(t): We can express cos2(t) in terms of x by rearranging the equation for x(t): x=3cos2(t) cos2(t)=3x
Expressing sin(t): Similarly, we can express sin(t) in terms of y by rearranging the equation for y(t): y=−3sin(t) sin(t)=−3y
Squaring sin(t): Now we square both sides of the equation for sin(t) to get sin2(t):sin2(t)=(−3y)2sin2(t)=9y2
Substitute into Identity: Substitute cos2(t) and sin2(t) into the Pythagorean identity:sin2(t)+cos2(t)=1(9y2)+(3x)=1
Clearing Denominators: Multiply through by 9 to clear the denominators: 9(9y2)+9(3x)=9(1)y2+3x=9
Rearranging Equation: Rearrange the equation to match the answer choices: y2=9−3x
More problems from One-step inequalities: word problems