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Find csc x if cotx= - sqrt(15)?

+2 votes
please help!!!!!!!!!!!!!!
asked Mar 11, 2013 in TRIGONOMETRY by linda Scholar

1 Answer

+2 votes

cotx  = -sqrt(15)

Square to each side

(cotx)2 = [-sqrt(15)]2

cot2X = 15

Recall : cot2X = csc2X -1

Substitue cot2X = csc2X -1

csc2X -1 = 15

Add 1 to each side

csc2X = 15+1

csc2X = 16

cscx =sqrt(16)

Therefore cscx = 4 or cscx =-4

 

answered Mar 11, 2013 by diane Scholar
reshown Mar 12, 2013 by bradely

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