cos Ө = 12/13
sec 2Ө = 1 / cos 2Ө = 1 / ( 2 cos²Ө - 1)
sec 2Ө = 1 / ( 2 x 144/169 - 1 )
sec 2Ө = 1 / ( 288/169 - 169/169 )
sec 2Ө = 1 / ( 119/169 )
sec 2Ө = 169/119
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cos Ө = 12/13
sec 2Ө = 1 / cos 2Ө = 1 / ( 2 cos²Ө - 1)
sec 2Ө = 1 / ( 2 x 144/169 - 1 )
sec 2Ө = 1 / ( 288/169 - 169/169 )
sec 2Ө = 1 / ( 119/169 )
sec 2Ө = 169/119