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# Exam Questions HH]elp watch

1. I need some help with these exam questions. Struggling with the proof of trig identities.

Thanks.

https://www.dropbox.com/sh/q829c1wi8...MwqF8Ra1a?dl=0
2. (Original post by Jeevs090909)
I need some help with these exam questions. Struggling with the proof of trig identities.

Thanks.
https://www.dropbox.com/sh/q829c1wi8...MwqF8Ra1a?dl=0

Start with the RHS. Express everything in terms of sin and cos, then get it under the same denominator.
3. (Original post by RDKGames)

Start with the RHS. Express everything in terms of sin and cos, then get it under the same denominator.
Thanks
4. (Original post by Jeevs090909)
Thanks
For the circle question, you simply need to get it in the form before you answer the questions. After you do that, part (a) is just to read off the centre. Then for part (b), you need to know that and hence whatever you end up with on the RHS in terms of , make that > 0 and hence deduce the inequality for
5. (Original post by Jeevs090909)
Thanks
For the other identity question, again, just express the LHS in terms of sines and cosines, get it under the same denominator, then spot the identity and use it before coming to a stop at the required result.
For part b, just set the RHS of the identity equal to 1 and observe further what happens why the equality yields no solutions.

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