a=arcsin(-1/3)是负锐角,
b=arccos(-2√2/3)=π-arccos(2√2/3)是钝角
c=arctan(-√2/4)=π-arctan(√2/4)是钝角
∵ b=π-arccos(2√2/3)=π-arctan(√2/4)=c
∴ a
a=arcsin(-1/3)是负锐角,
b=arccos(-2√2/3)=π-arccos(2√2/3)是钝角
c=arctan(-√2/4)=π-arctan(√2/4)是钝角
∵ b=π-arccos(2√2/3)=π-arctan(√2/4)=c
∴ a