计算：cos（π/8）*sin（π/8）=?
3个回答
cos（π/8）*sin（π/8）=1/2*（2*cos（π/8）*sin（π/8））=1/2*sin（π/4）
=根号2/4
相关问题
(cosπ/8+sinπ/8)（cos^3π/8-sin^3π/8）.
sinπ/8cosπ/8根据什么公式计算?
sin²π/8 -cos²π/8
sin*2π/8+cos*27π/24+sinπ/8cos7π/24
计算,sin(π/12)-sin(5π/12)+2sin(π/8)sin(3π/8)
sin^4π/8-cos^4π/8=?
cos(3π/8)*sin(5π/8)=?
cos2π8-sin2π8= ___ ．
f(x)=1-2sin^2(x+π/8)+2sin(x+π/8)*cos(x+π/8)=cos(2x+π/4)+sin(
cos^4π/8sin^4π/8等于