1, cartesian coordinate system r = a (1-sinθ)/r = 2a * (1+cosθ).

In the polar coordinate system, it is a heart, a trajectory formed when a fixed point on a circle rolls around another circle with the same radius and tangent to it.

2、 128√e986

A beautiful female student called her sweetheart to the classroom to express her love and wrote 128√e986 on the blackboard. Then she smiled shyly, and then erased other parts of her expression as high as E, leaving an I on the blackboard. Love? Your English letters (I love you).

In Cartesian coordinate system, the parametric equation of the heart line is:

x(t)=a(2cost-cos2t).

y(t)=a(2sint-sin2t).

The general equation is x? +y？ +ax=a*sqrt(x？ +y？ ) and x? +y？ -ax=a*sqrt(x？ +y？ )。

The equation in the polar coordinate system is:

ρ(θ)=2r( 1+/-cosθ).

P(θ)=2r( 1+/-sinθ).