题目

tana=e^4(sin4+cos4)=tana= =(根号2)e^4(sin[4+(pi)/4] =(根号2)e^4(sin[pi-4-(pi)/4] -(pi)/2

提问时间：2020-10-24

答案

pi 表示圆周率π.
百度百科：特殊符号.
= = = = = = = = =
tan a =e^4 (sin 4 +cos 4)
=√2 (e^4) sin (4 +π/4)
=√2 (e^4) sin (π -4 -π/4),
... ...