Question

sin（x）+cos（x）=0 且0小于等于x小于等于π 求x

Answer 1

∵sin（x）+cos（x）=0

1+sin(2x)=0

sin(2x)=-1

∵π≥x≥0

2π≥2x≥0

∴2x=3π/2

x=3π/4