证明根号3sina-cosa=2sin(a-π/6)

问题描述:

证明根号3sina-cosa=2sin(a-π/6)

根号3sina-cosa
=2(根号3/2*sina-1/2*cosa)
=2(sinacosπ/6-cosasinπ/6)
=2sin(a-π/6)