若a为锐角,cos(a+30)=4/5,则sin(2a+15)=
若a为锐角,cos(a+30)=4/5,则sin(2a+15)=
已知角a为锐角,sin(A+15°)=4/5,则cos(2A-15°)=
a为锐角 cos(a+π/6)=4/5 求sin(2a+π/12)
已知a为锐角,且sin a+cos a=根5/2,求sin a*cos a的值
三角函数:设a为锐角,若cos(a+π/6)=4/5,则sin(2a+π/12)的值为多少?
、设a为锐角,若cos(a+pi/6)=4/5,则sin(2a+pi/12)的值为?
设a为锐角,若cos(a+π/6)=4/5,则sin(2a+π/12)的值为多少?
设a为锐角,若cos(a+pi/6)=4/5,则sin(2a+pi/12)的值为?
设a为锐角,若cos(a+π/6)=4/5,则sin(2a+π/12)的值为?
设a为锐角,若cos(a+π/6)=4/5,则sin(2a+π/12)值为
设a为锐角,若cos(a+π/6)=3/5,则sin(a-π/12)=
设A为锐角 若cos(A+π/6)=0.8,则sin(2A+π/12)=?