定义运算a♡b=a^2-ab-b^2,则,sinπ/6♡cosπ/6=?

定义运算a♡b=a^2-ab-b^2,则,sinπ/6♡cosπ/6=?
定义运算a♡b=a^2-ab-b^2,则,sinπ/6♡cosπ/6=?

定义运算a♡b=a^2-ab-b^2,则,sinπ/6♡cosπ/6=?
a♡b=a²-ab-b²
sinπ/6♡cosπ/6
=sin²(π/6)-sin(π/6)cos(π/6)-cos²(π/6)
=(-2-√3)/4

-√3╱4-1╱2