求值sin(-236π
求值:sin(π/12)+cos(π/12)
不查表求值:cos5π/12·sinπ/12=
求值:⑴sin(-19π/3)*cos(19π/6)
化简求值:sin(π4−3x
求值并比较sin(-54π/7)与sin(-63π/8)的大小
sin^a+cos^(π/6+a)+1/2sin(2a+π/6)求值
求值sin25π/6+cos25π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-
化简求值sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)
不求值,分别比较下列各组中两个三角函数值的大小(1)sin(-π/7)和sin(-π/5)
不通过求值,比较下列各组中两个三角函数值的大小 sin(-54π/7),sin(-63π/8)
求值sin^2a+cos^2a(π/6+a)+1/2sin(2a+6/π)
已知sinβ+cosβ=1/5,β∈(0,π) ,求值!①tanβ ②sinβ