A-Level Maths E6-14 Equivalent Forms: Solve 2sin(2x) + 3cos(2x) = 1

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I just wanted to say how amazing you are, i didn't understand this at all in lesson but ive just finished watching all 14 vids of the playlist and as always you have helped me understand the topic. You're the best!

xd_hp
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you're a life saver, i would be crying right now if it wasn't for you

uziibe
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could you please explain why you used Rsin(2x+alpha)

llgrums
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If I was to solve this equation in the exam my first inital thought would not to solve it using this method and instead use double angle approximations for the whole thing. Would this work still or do you have to solve it this way.

skyeforster
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Nice but why are you adding on 180 for your thetas at the end? It's sin, not tan so you should be adding 360 right?

alrightydave
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im confused about the +180 bits. how did you know to do that?

lukavandevelde