已知函数y=asin(2x+Pai/6)+b(a不等于0)在[0,Pai/2]上的值域为[-5,1],求a,b的值
问题描述:
已知函数y=asin(2x+Pai/6)+b(a不等于0)在[0,Pai/2]上的值域为[-5,1],求a,b的值
答
令-π/2+2kπ≤2x+π/6≤π/2+2kπ解得 -π/3+kπ≤x≤π/6+kπ即y的增函数区间为[ -π/3+kπ,π/6+kπ]同理得减区间为[ π/6+kπ,2π/3+kπ],k∈Z所以y在[0,π/6]上增,在[π/6,π/2]上减,所以,当x=π/6时,sin(2x+π...