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# Trig equation/ identity watch

1. how to change
to

I would have thought it would be
2. (Original post by joyoustele)
how to change
to

I would have thought it would be
It would indeed be. Did you read the question right...?
3. (Original post by RDKGames)
It would indeed be. Did you read the question right...?
Yep,the question was: to express in terms of sinx and cosx

which i got

then in part (ii) it said to show that
4. (Original post by joyoustele)
Yep,the question was: to express in terms of sinx and cosx

which i got

then in part (ii) it said to show that
5. (Original post by joyoustele)
Yep,the question was: to express in terms of sinx and cosx

which i got

then in part (ii) it said to show that

...
6. (Original post by RDKGames)
how did you get
7. (Original post by Notnek)

...
oh
8. BTW thank you guys very much. RDKGames Notnek thanks to you guys, and exam solutions i went from an E(predicted) to an A in maths. i even think an A* overall grade could be on the cards for me now. Thanks alot.
9. (Original post by joyoustele)
BTW thank you guys very much. RDKGames Notnek thanks to you guys, and exam solutions i went from an E(predicted) to an A. i even think an A* overall grade could be on the cards for me now. Thanks alot.
That's really great to hear! Keep asking for help whenever you're stuck and aim for the A*

By the way, for trig especially you need to practice as many different questions as possible because there's so much recognition of identites and little tricks that you can only pick up with practice. For example in this question you needed to spot that you have the form which is part of the identity for .
10. (Original post by Notnek)
That's really great to hear! Keep asking for help whenever you're stuck and aim for the A*

By the way, for trig especially you need to practice as many different questions as possible because there's so much recognition of identites and little tricks that you can only pick up with practice. For example in this question you needed to spot that you have the form which is part of the identity for .
Will do. Thank you very much.
I will be getting that A*

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