请问正弦2分之7派+余弦11派+正弦5派+正切8派等于多少,
问题描述:
请问正弦2分之7派+余弦11派+正弦5派+正切8派等于多少,
答
=sin(2π+3π/2)+cos(10π+π)+sin(4π+π)+tan8π
=sin(3π/2)+cosπ+sinπ+tan0
=-1-1+0+0
=-2