3倍根号5sinx+3倍根号5cosx 化简
问题描述：
3倍根号5sinx+3倍根号5cosx 化简
答
原式=3√10(√2/2*sinx+√2/2cosx)
=3√10(sinxcosπ/4+cosxsinπ/4)
=3√10sin(x+π/4)