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Reciprocal Identities:
 sin u =  \frac{1}{csc u}           cos u =  \frac{1}{sec u}

 tan u =  \frac{1}{cot u}            cot u =  \frac{1}{tan u}

csc u =  \frac{1}{sin u}            sec u =  \frac{1}{cos u}

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