Cos²α-sin²α=Cos²α
Cos²α-sin²α-Cos²α=0
-sin²α=0
sin²α=0
sinα=0
α=0+kTT, kEC
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Cos²α-sin²α=Cos²α
Cos²α-sin²α-Cos²α=0
-sin²α=0
sin²α=0
sinα=0
α=0+kTT, kEC