2x+π/6=0 x=-π/12 , y=0 点(-π/12,0)
2x+π/6=π/2 x=π/6 , y=1 点(π/6,0)
2x+π/6=π x=5π/12 , y=0 点(5π/12,0)
2x+π/6=3π/2 x=8π/12 , y=-1 点(8π/12,0)
2x+π/6=2π x=11π/12 , y=0 点(11π/12,0)
三角函数的五点法怎么作图
比如y=2sin(2x+pai/6)
解:T=2pai//2/=2pai/2=pai
取一端区间长度为pai的区间高中数学必修二三角函数五点法,
先求出零点
2sin(2x+pai/6)=0
sin(2x+pai/6)=0
2x+pai/6=kpai
令k=1
2x+pai/6=pai
2x=5pai/6
x=5pai/12
区间为[5pai/12,5pai/12+pai]=[5pai/12,17pai/12]
x1=5pai/12,x2=5pai/12+pai/5=37pai/60
x3=37pai/60+pai/5=49pai/60
x4=61pai/60
x5=61pai/60+pai/5=17pai/12.
得出五个点,然后顺次连接。