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Thanks man! That's really helpful. Out of curiosity, how did you know to change the cos2x to 2cos^2x-1 rather than for example cos^2x - sin^2x??? How did you know which one to use? Thanks!

Hey guys, Can you guys please help with this identity? Cambridge doesn't provide proofs. This is question 13m from chapter 2A of the Cambridge Year 12 Textbook. Thanks guys. https://i.gyazo.com/934bde58b5ffb5259c2aed97eac9a52f.png

Hey guys, I was just going though some Perms and Combs questions for my exam tomorrow and I came across this question: A serial number is made up of 4 letters and 2 numbers. If zero is not allowed, find how many serial numbers are possible. Now, the answers say that it is 37015056 which is...

Hey guys, just a quick background, I'm a Year 11 student currently doing MX1, Adv. English, Physics, Chem, Bio. Recently, I've noticed that (especially in my Chem class) a few people in my class are going ahead, some with tutoring and some by themselves. Now, I really wanted to do this, and...