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(2)は、1+(tanθ)^2=1/(cosθ)^2と、
(sinθ)^2+(cosθ)^2=1を利用します。
(3)は、cosθ=−1/√2となります。
(4)は、sinθが−1/2以下となります。
(5)は、(sinθ)^2=1−(cosθ)^2を利用して、
cosθについての2次方程式に帰着させます。