cos(pi/4-a)=1/7,sin(3pi/4+b)=11/14
问题描述:
cos(pi/4-a)=1/7,sin(3pi/4+b)=11/14
cos(pi/4-a)=1/7
sin(3pi/4+b)=11/14
pi/4
答
π/4
cos(pi/4-a)=1/7,sin(3pi/4+b)=11/14
cos(pi/4-a)=1/7
sin(3pi/4+b)=11/14
pi/4
π/4