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Geometry Level 2

k=150[(1+tan(k)+sec(k)) (1+cot(k)csc(k))]= ?  \displaystyle \sum_{k=1}^{50} \Bigg [ \bigg(1 + \tan(k^\circ)+\sec(k^\circ)\bigg)\ \bigg(1+\cot(k^\circ)-\csc(k^\circ) \bigg)\Bigg]=\ ? \

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