Hi friends,

I got stuck with this, and Google is not much help...please if someone would help me?

Determine without a calculator:

\({Cos72 \over{Sin24}}+{Sin72 \over{Cos24}}\)

This gives

\({Cos72Cos24+Sin72Sin24} \over{Sin24Cos24}\)

I do not see how to go further?..any help please?..Thank you kindly..

juriemagic Apr 18, 2023

#1

#2**+1 **

Tiggsy,

Yes, I see,

The top would then be

\(Cos(72-24)\)

but the bottom part...I really do not see how to re-write that..

juriemagic
Apr 18, 2023

#3**+1 **

I have here something that shows that (Sin(x)Cos(x)) can be written as \({1 \over2}(2SinxCosx)\)

How do they get to that?..please?

juriemagic
Apr 18, 2023