Q5 of 303 Page 4

Evaluate each of the following:

cosec can be written as cosec


cosec = –cosec


Also,


–cosec(θ) = cosec(–θ)


⇒ –cosec = cosec


Now the question becomes cosec–1(cosec)


cosec–1(cosec x) = x


Provided x ϵ –{0}


∴ we can write cosec–1(cosec.


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