A:what the baby giraffe likes eating
B:when the baby giraffe was born
C:why the baby giraffe looks unhappy
D:where the baby giraffe came from
已知曲线C1的参数方程为x=-2+10cosθy=10sinθ(θ为参数),曲线C2的极坐标方程为ρ=2cosθ+6sinθ.
将曲线C1的参数方程化为普通方程,将曲线C2的极坐标方程化为直角坐标方程;