sin(-2)+cos(-2-π)·tan(2-4π)化简
化简:[sin(π+α)*cos(π-α)*tan(π-α)]/[cos(π/2+α)*tan(3π/2-α)*tan(
[sin(2π+α)·tan(-α)·cos(-α)]÷[sin(-α)·cos(2π+α)·tan(2π+α)化简
cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?.
化简:sin(π-a)cos(2π-a)tan(-a+π/2)/cos(-a)
化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π
已知tan(θ+π/4)=-2,求cosθ平方+sinθcosθ-1
化简2cos*2-1 / 2tan(π/4-x)sin*2(π/4+x)
化简:(2cos^2α-1)/[2tan(π/4-α)sin^2(π/4+α)]
化简2cos平方a-1/2tan(π/4-a)sin平方(π/4+a)
化简(2cosα-1)/(2tan(π/4-α)*sin(π/4+α))
化简(2cos²α-1)/2tan(π/4+α)sin²(π/4-α)
化简(2cos²α-1)/[2tan(π/4-α)sin²(π/4+α)]