sin π/8 sin 3π/8=

sin π/8 sin 3π/8= 计算,sin(π/12)-sin(5π/12)+2sin(π/8)sin(3π/8) 1-2sin²π/8=sinπ/4 化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)= 比较下列各组中两个函数值的大小sin [(-54/7)π]&sin [(-63/8)π]sin [sin(3/8)π]&sin [cos(3/8)π] sinφ=sin(8/3π+φ)时φ=? sinπ/8cosπ/8=( ) 绝对值sin八分之π 等于多少 /sinπ/8/ 2sin(α+π/3）=sinα+______ 比较大小(1)sin(-π/11)与sin(-π/17) (2)-sin(54π/7)与sin(-63π/8) (3)sin231°与cos260° 2sin π/6 =sin π/3,吗,求解释,还有-sin π/6=sin- π/6吗 已知sin(3π-α)=-2sin(π/2+α)则sinαcosα cos(3π/8)*sin(5π/8)=? sin(2*3π/8+φ)=o怎么解 (cosπ/8+sinπ/8)（cos^3π/8-sin^3π/8） (cosπ/8+sinπ/8)（cos^3π/8-sin^3π/8）. (cos π/8+ sin π/8 ) (cos^3 π/8+sin^3 π/8 )的值. cos 5π/8 cos π/8 + sin 5π/8 sin π/8=