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# Trig Identities question Watch

1. What is the first step to consider when doing these questions? I try using sin^2 theta = 1 - cos^2 theta etc but I seem to get no where. I tried writing as and tried stuff from there to no avail.

Thanks
2. (Original post by UKBrah)

What is the first step to consider when doing these questions? I try using sin^2 theta = 1 - cos^2 theta etc but I seem to get no where. I tried writing as and tried stuff from there to no avail.

Thanks

It's a perfect square

and in fact, for all theta, it equals one.
3. It sure does, thanks mate.
Are there any other algebraic identities I should be aware of, like ?
4. (Original post by claret_n_blue)
Are you sure?
5. (Original post by Farhan.Hanif93)
Are you sure?
is that the one implied?
6. (Original post by UKBrah)
It sure does, thanks mate.
Are there any other algebraic identities I should be aware of, like ?
Well, it would help to know the binomial theorem.

where

7. (Original post by Farhan.Hanif93)
Are you sure?
Oops.
8. (Original post by UKBrah)
is that the one implied?
Not quite; the RHS is equivalent to but .

(Original post by Indeterminate)
Well, it would help to know the binomial theorem.

where

(with )
9. (Original post by Farhan.Hanif93)
Not quite; the RHS is equivalent to but .

(with )

Yep, but since they don't go into sets at A-level, I'd tell an A-level student that n is an integer.

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