根号2(sinx-cosx)
问题描述:
根号2(sinx-cosx)
要求是利用和差公式化简
有急用,明天就叫作业了···
答
原式=2(sinx*√2/2-cosx*√2/2)
=2(sinxcosπ/4-cosxsinπ/4)
=2sin(x-π/4)