(2cos^2-1)/2tan(π/4-α)sin^2(π/4+α)
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求证:1/cosα-tanα=1/tan(π/4+α/2)
(1-tan^4θ)cos^2θ+tan^2θ
求证2(cosθ -sinθ )/1+sinθ +cosθ =tan(π/4-θ /2)-tanθ /2
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求证:tanα+1/tan(π/4+α/2)=1/cosα帮个忙!
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tan(π/4+α)=2,求1/(2cosαsinα+cos^2α)
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求值:2cosπ/2-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6+sin3π/2 -1/4cosπ