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# Maths question...Urgent help please!! watch

1. How to solve the equation 2cos^2 x+sin2x=1...I know that I should put them into the form like cos(x+a), but I don't know what to do with the different angles cuz the first part is x but the second part is 2x
2. (Original post by Oliviazh)
How to solve the equation 2cos^2 x+sin2x=1...I know that I should put them into the form like cos(x+a), but I don't know what to do with the different angles cuz the first part is x but the second part is 2x
Please post this in the maths forum

You've identified the problem - that one is in terms of 2x and the other in x, and you want them to be the same so you can use Rcos(x+a) (or sin, but you will be able to figure it out when you need to).. So what can you do?
3. (Original post by SeanFM)
Please post this in the maths forum

You've identified the problem - that one is in terms of 2x and the other in x, and you want them to be the same so you can use Rcos(x+a) (or sin, but you will be able to figure it out when you need to).. So what can you do?
I know what to do now...Don't know how could I be so stupid before
4. You could take the away from both sides giving

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