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ტრიგონომეტრიული ზღვრები ორმაგი კუთხის იგივეობის გამოყენებით

სალი პოულობს (1+√2sinθ)/(cos2θ)-ის ზღვარს  θ=-π/4-ში გამოსახულების კოსინუსის ორმაგი კუთხის იგივეობის გამოყენებით გადაწერით.

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