sin(x+A)例如√2sin(x+pai/4)怎么求?
问题描述:
sin(x+A)例如√2sin(x+pai/4)怎么求?
答
√2sin(x+pai/4)
=√2[sinxcos(π/4)+sin(π/4)cosx]
=√2[(√2/2)sinx+(√2/2)cosx]
=sinx+cosx有没有套用的公式啊?sin(a+b)=sinacosb+sinbcosa