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# Mathematics C3 solution Watch

1. Does anyone know how to solve this question?

Solve the equation, giving all values of x to the nearest degree in the interval 0<x<360: 2tan²x + secx - 1 = 0
2. Use
3. (Original post by susans_crumpets)
Does anyone know how to solve this question?

Solve the equation, giving all values of x to the nearest degree in the interval 0<x<360: 2tan²x + secx - 1 = 0
Use identity
4. Use the identity and see where that gets you
5. Use this identity
6. Well, nice to know at least three people have given the same advice eh?
7. (Original post by dancepiratedance)
Well, nice to know at least three people have given the same advice eh?
Reckon we need more people to say the same thing?
8. (Original post by RDKGames)
Reckon we need more people to say the same thing?
I think so, just to be absolutely sure
9. Use:

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