给出下列各函数值：①sin(-1000°)；②cos(-2200°)；③tan(-10)；④sin(7π/10)cosπ/tan

给出下列各函数值：①sin(-1000°)；②cos(-2200°)；③tan(-10)；④sin(7π/10)cosπ/tan(17π/9)其中符号为负的有()
A、①
B、②③
C、③
D、①④
【正确答案】：C