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the top should be like 4(tan 7.5)(1-tan^2(7.5)) right? can you guide me through it please? do you change the tan^2(7.5) to like sec^2(7.5) - 1 and proceed from there? goshh do each question need this kind of working out? its huge!

you mean replace t now with t=7.5?

i know that but how do you use that in this scenario..i dont see many ways of making this in terms of sin unless you convert tan...is this question supposed to be hard? its supposedly the "easier" questions in yr12 3u!

iight now what? the answer is sin 30 = 1/2 and that completely entirely (add some other adjective here) puzzles me!

you be the judge LOL..it seems way too complicated then it should be! can you verify those steps are right. And if they are do I sub tan 7.5 back in? be warned its really big!

and when you do this you get answer in terms of t. Does that mean you replace t again with tan7.5? can you list all the steps for me to get the answer? i dont quite get how you can end up with an exact value out of this especially with 15 unless you use 45 and 30 and subtract? As you can see im...

you shoulda just said you were testing me! with 4b) tho you cant use the double angle formula for tan. Or can you?

its just that the question wants me to solve in terms of t and i dont really know how for this question.. i noticed the double angle formula there but then shouldnt: 2tan(11pi/12))/(1-tan^2(11pi/12)) = tan (11pi/6) ? did you like jump a step and then equate that to t? so then you multiply by 2?

Thanks for the solution. I dont quite understand how this step works 2tan(11pi/12))/(1-tan^2(11pi/12)) = tan (2 . 11pi/6) also in class today we learnt some substitutions that replaced tan, cos and sin can be seen here: http://en.wikipedia.org/wiki/Tangent_half-angle_formula#Identities I was...

yeah im dead serious! I actually asked the questions before and entitled it 'questions' but it seems that the one i called 'questions' this time was in a different folder and that was why this came up! Thanks!

I feel so stupid, I uploaded the wrong screenshot....below are the questions i need help with

i got these questions for hw and kinda stuck how to do them..I know the three equations for t for sin cos and tan but im a bit stuck how to use them..solutions would be much appreciated!

Re: What school you at? girraween =] i noticed faye posted before :P

Dhruv's a great tutor highly recommended! :)

that would be asking a lot changing schools for your final year wouldnt it?

well i guess it depends on subs? like in math in girra im like 15th in 2u but a few marks more and i could easily be first..so i get what ur saying especially with dumb people in my cohort! people actually get 20% in 2u like omgg

hussey is like the only one without a hundred yet in this series yes? has he mustered a 50 yet?

that seems like a great total considering what the wicket was doing and all and the windies getting 200ishh. whats ur says on hayden coming back in the team? I feel hussey since hes out of form deserves being 'rested'. You cannot possible leave our either jacques or katich seeing those...

ah right i did not know that. daym i wish i went to selective since yr 7 cause then its really possible to climb ur way up to ruse by the end of yr10 and finish there =[ my parents regret that tooo

well i know 6 ppl left girra and went to baulko for this yr and thats for yr 11..so baulko mustve had quite a few places at hand too