# Trig Identity helpWatch

#1
If show that

I started by doing 1 over both sides of the first equation and ended up tidying the R.H.S to which I now can't do anything with. I'm assuming I have gone about the question wrong from the start but I can't see how I could start differently, help would be appreciated!

cheers.
0
7 years ago
#2
Do you know an identity connecting and ?
0
7 years ago
#3
think about how you can rearrange the trigonometric identity:
0
#4
(Original post by Mr M)
Do you know an identity connecting and ?

(Original post by aviva_123)
think about how you can rearrange the trigonometric identity:
I know now that I can basically rationalise the denominator of and then solve it fairly easily, out of interest what method were you both suggesting? The only way I saw of being able to use was to square everything and that didn't seem to help much....
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7 years ago
#5
(Original post by TheJ0ker)
I know now that I can basically rationalise the denominator of and then solve it fairly easily, out of interest what method were you both suggesting? The only way I saw of being able to use was to square everything and that didn't seem to help much....
Difference of two squares?
0
#6
(Original post by Mr M)
Difference of two squares?
Oh I see now, I would never have seen that by myself..... Cheeky trig identities.

Thanks for the help.
0
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