化简:(1)根三sinx+cosx (2)sinx-cosx (3)3sinx+4cosx (4)根二sin(π/4-x)
问题描述:
化简:(1)根三sinx+cosx (2)sinx-cosx (3)3sinx+4cosx (4)根二sin(π/4-x)
化简:(1)根三sinx+cosx (2)sinx-cosx (3)3sinx+4cosx (4)根二sin(π/4-x)
答
1)2sin(x+π/6)
2)根号2sin(x-π/4)
3)5sin(x+arccos3/5)
4)1/2(cosx-sinx)