tan=3,π
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tan=3,πtan=3,πtan=3,π(cosa-sina)^2=(cosa)^2+(sina)^2-2sinacosa=1-sin(2a)sin2a=2tana/(1+tana)^2=6/4^2
tan=3,π
tan=3,π
tan=3,π
(cosa-sina)^2=(cosa)^2+(sina)^2-2sinacosa=1-sin(2a)
sin2a=2tana/(1+tana)^2=6/4^2=3/8
(cos-sina)^2=5/8
π
tan=3,π
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