sin(-θ)cos(180度+θ)tan(θ-90度)/cos(θ-360度)sin(180度+θ)tan(90度-θ) 化简
问题描述:
sin(-θ)cos(180度+θ)tan(θ-90度)/cos(θ-360度)sin(180度+θ)tan(90度-θ) 化简
答
解
[sin(-θ)cos(180+θ)tan(θ-90)]/[cos(θ-360)sin(180+θ)tan(90-θ)]
=[-sinθ(-cosθ)tan(θ-90)]/[cosθ(-sinθ)(-tan(θ-90)]
=[sinθcosθtan(θ-90)]/[cosθsinθtan(θ-90)
=1