三角函数,共5题,

题目

三角函数,共5题,
sec^2(x)=8cos(x),-pi<x<=pi (rad)
2cos(x)+sin(2x)=0,-180<x<=180 (deg)
2sin(x)=cos(2x),0<=x<2pi (rad)
sec^2(x)-tan(x)-1=0,0<=x<2pi (rad)
2sin(2x)cos(3x)+cos(3x)=0,0<=x<=180 (deg)

答案

sec^2(x)=8cos(x), -pi