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sin 20 x cos 20 = 8/25
1/sin 20 - 1/cos 20 = 2,9238044 - 1,064177772 = 1,859626628
(cosα-sinα)² = ײ
cos²α - 2cosα·sinα + sin²α = ײ
(cos²α + sin²α) - 2· = ײ
1 - = ײ
=ײ
× =
cosα - sinα =