If cot^2x=5/7, then csc^2 is equivalent to
a)12/7
b)7/5
c)5sqrt(74)/74
d)sqrt(74)/7

Question

If cot^2x=5/7, then csc^2 is equivalent to 
a)12/7
b)7/5
c)5sqrt(74)/74
d)sqrt(74)/7

hartnn · Answer

use the relation,
$\csc^2x = 1+ \cot^2 x$

hartnn · Answer

cot^2 x is given , just plug in values to get csc^2 x!

hartnn · Answer

whats 1+ 5/7 =.... ?

anonymous · Answer

i got 1.71

hartnn · Answer

don't use calculator, 
try to get answer in fraction only...

hartnn · Answer

or, you can seee which option comes out to be 1.71......

anonymous · Answer

i still dont understand

hartnn · Answer

1+5/7 = (7+5)/7 = ... ?

anonymous · Answer

it would be 6/7/=12/7

hartnn · Answer

it would be 12/7, yes.

anonymous · Answer

how did you get 6/7

hartnn · Answer

i never got 6/7
i got, $1+\dfrac{5}{7}= \dfrac{7+5}{7}=\dfrac{12}{7}$

anonymous · Answer

and how did you get the 1 there.sorry if im askin so much questions im trying to understand.when i read the question sometimes i dont know how to start them or dnt know what they want to do when it comes to math/

hartnn · Answer

1 comes from this relation,
$\huge \csc^2x = 1+ \cot^2 x$

hartnn · Answer

thats the standard relation, which you should've have memorized ...so that you can use here...