[tex]\frac{6}{cos^{2} 23 + cos^{2} 113}[/tex]
6 6
------------------------------ = ------------------------ = 6/1 = 6
cos²23+cos²(90+23) cos²23+sin²23
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6 6
------------------------------ = ------------------------ = 6/1 = 6
cos²23+cos²(90+23) cos²23+sin²23
..................................................................................................