1、化简 (tan2π-θ)sin(-2π-θ)cos(6π-θ)/cos(θ-π)sin(5π+θ)2、化简 sin(15π/2+α)cos(α-π/2)/sin(9π/2-α)cos(3π/2+α) 3、求证 sin(π/2+θ)-cos(π-θ)/sin(π/2-θ)-sin(π-θ)=2
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1、化简 (tan2π-θ)sin(-2π-θ)cos(6π-θ)/cos(θ-π)sin(5π+θ)2、化简 sin(15π/2+α)cos(α-π/2)/sin(9π/2-α)cos(3π/2+α) 3、求证 sin(π/2+θ)-cos(π-θ)/sin(π/2-θ)-sin(π-θ)=2
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