cos(α-π)除以sin(π减α)乘以sin(α-2π)乘以cos(2π-α)化简
cos(α-π)除以sin(π减α)乘以sin(α-2π)乘以cos(2π-α)化简
化简:(1)、tan(2π+α)tan(π+α)cos(-π-α)的3次方分之sin(-α)的平方乘以cos(π+α);
已知角α在第一象限且cosα=3/5.则1+根号2乘以cos(2α-π/4)的和再除以sin(α+π/2)
α∈(0,π/2 ),比较 sin(cosα) 与cos(sinα)大小
已知(3sinα+cosα)/(3cosα-sinα)=2,则2-3sin(α-3π)sin(1.5π-α)-[cos(
化简[sin(π/2-α)cos(π/2-α)]/cos(π+α)-[sin(π-α)cos(π/2-α)]/sin(π
化简:[ cos(α-π/2)/sin(5π/2+α) ] ×sin(α-2π) × cos(2π-α)
sin(π/2+α)·cos(π/2-α)/cos(π+α)+sin(π-α)·cos(π/2+α)/sin(π+α)=
已知cos(π/2+α)=sin(α-π/2) 求sin(π-α)-cos(π+α)/cos(5π/2 -α)+2sin
已知α∈(π,2π) sinα+cosα=1/5 求sinα*cosα sinα-cosα
已知tan(3π+α)=2,求:1、(sinα+cosα)²;2、sinα-cosα/2sinα+cosα
已知tan(π-α)=2,求sinα-2sinαcosα-cosα/4cosα-3sinα的值