a为锐角 cos(a+π/6)=4/5 求sin(2a+π/12)
问题描述:
a为锐角 cos(a+π/6)=4/5 求sin(2a+π/12)
答
a是锐角
π/2
a为锐角 cos(a+π/6)=4/5 求sin(2a+π/12)
a是锐角
π/2