Licson Lee => YSITD: 1/2 sqrt(4-x^2) 和 x^3 cos(x/2) sqrt(4-x^2) #60b487ab237860daba8ef24d

Licson Lee says to YSITD

1/2 sqrt(4-x^2) 和 x^3 cos(x/2) sqrt(4-x^2)

at Mon, May 31, 2021 2:52 PM