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2014-11-04T15:56:45+05:30
Identity is cosec square tita-cot square tita=1
asquare-bsquare=(a+b)(a-b)
(cosec tita+cot tita)(cosec tita-cot tita)=1
p(cosec tita-cot tita)=1
cosec tita-cot tita=1/p
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you can see the option are at the bottom when you open the answer tab they are represented by symbols like "pie" , "omega" etc
2014-11-04T16:10:29+05:30

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Given
cosecФ + cotФ = p
we know that 
cosec²Ф - cot²Ф = 1
⇒(cosecФ + cotФ)(cosecФ - cotФ) = 1

⇒p x (cosecФ - cotФ) = 1

⇒(cosecФ - cotФ) = 1/p

so 
(cosecФ - cotФ) = \frac{1}{p}
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