cos11π/4+tan(-7π/6)+sin(-π)+cos(-5π/6)
问题描述:
cos11π/4+tan(-7π/6)+sin(-π)+cos(-5π/6)
答
cos11π/4+tan(-7π/6)+sin(-π)+cos(-5π/6)
=cos3π/4+tan(-π/6)+sin(π)+cos(5π/6)
=-√2/2-√3/3+0-√3/2
=-√2/2-5√3/6