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# A level maths- trigonometry. watch

1. Anyone know how to go about this?

2sin^2 theta = cos theta + 1
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2. (Original post by JMR2017)
Anyone know how to go about this?

2sin^2 theta = cos theta + 1

Then you have a quadratic in cos.
3. (Original post by JMR2017)
Anyone know how to go about this?

2sin^2 theta = cos theta + 1
You can replace with , and then it may help to use the substitution to gain a quadratic in which you can solve for , from which you can find .
4. (Original post by RDKGames)

Then you have a quadratic in cos.
Ok thanks
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