化简sin(θ-5π)cos(π/2+θ)cos(4π-θ)/cos(3π-θ)sin(θ-3π)sin(-θ-4π)

问题描述:

化简sin(θ-5π)cos(π/2+θ)cos(4π-θ)/cos(3π-θ)sin(θ-3π)sin(-θ-4π)

原式=-sin(θ)*(-1)sin(θ)cos(θ)/-cos(θ)*(-1)sin(θ)*(-1)sin(θ)=-1