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2014-11-02T17:12:12+05:30

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Cosec Ф = √5
sin Ф = 1/cosec Ф = 1/√5

we know that sin² Ф + cos² Ф = 1
⇒cos² Ф = 1 - sin² Ф
⇒cos Ф = √(1 - sin² Ф)

⇒cos Ф =  \sqrt{1-  (\frac{1}{ \sqrt{5} } })^{2}  = \sqrt{1- \frac{1}{5} } = \sqrt{ \frac{4}{5} } = \frac{2}{ \sqrt{5} }

⇒cos Ф =  \frac{2}{ \sqrt{5} }

cot Ф = cos Ф / sin Ф =  \frac{2/ \sqrt{5} }{1/ \sqrt{5} } = 2
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Check your answer for cot
already done brother!!
refresh..you will see the correct one
CotA=2
Okay my mistake
2014-11-03T06:08:30+05:30
If coesc Ф=√5,then hypotenuse =√5and opp side=1and adjacent side=2
cotФ=2,cosФ=2/√5
cotФ*cosФ=2*2/√5=4/√5
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