√(3)sin(-1200°)tan11/6π-cos585°tan(-37/4π)
确定cos7/12π,sin(-465°),tan11/3π,sin3*cos4*tan5的符号
求下列函数值:根号3sin(-1200°)cos35/3派-cos585°tan(-3派/4)
tan11π/*6cos(-25π/6)*sin(-23π/6)
SIN(-7/6π),cos(15/4π),tan(-8/3π),tan(33/4π)
已知α∈(0,π|2),2tanα+3sinβ=7,且tanα-6sinβ=1,求sinα的值
sin(-21π/4) cos(-20π/3) tan(-19π/6)=
sin(2a+π/4)化简成tan
tan(-11π/6)、sin(-16π/3)、cos120°、cos(-180°-β)的求解过程.
已知tan(α+π/4)=3,求cosα+2sinα/cosα-sinα的值
cos(9π/4)+tan(-7π/6)+sin(21π)=
tan(13π/3)+sin(-5π/2)+cos(-23π/6)
已知sin(a-π/4)=7√2 ̄/10,cos 2α=7/25,求sinα及tan(α+π/3)