/sci/ - Science & Math

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Trig Anonymous Wed Apr 10 22:26:09 2013 No.5676345 [Reply] [Original]

Hey /sci/ having a bit of trouble with trig. I am wondering if my logic is sound in getting from the blue circle to the red one.

My logic:
>subrtact 2theta -theta
>giving me sin theta on top
>cancel numerator sin theta with denominator sin theta, leaving me with 1/cos theta (desired result.) Is that the order of steps?

>>	Anonymous Wed Apr 10 22:33:54 2013 No.5676365 Yup.

>>	Anonymous Wed Apr 10 22:33:54 2013 No.5676367 Fuck our education system.

>>	Anonymous Wed Apr 10 22:35:23 2013 No.5676370 >>5676365 Thank you.

>>	Anonymous Wed Apr 10 22:40:38 2013 No.5676381 >>5676367 no, fuck my school. fucking bastards are making "custom books" so you HAVE to buy them from the bookstore It's bullshit.

>>	Anonymous Wed Apr 10 22:50:08 2013 No.5676399 >>5676381 Uh, nobody cares. Point is, you had to ask whether 2@ - @ = @ is a valid step. This is a gigantic education fail.

>>	Anonymous Wed Apr 10 23:06:40 2013 No.5676424 >>5676381 The secrets of basic subtraction can only be found in custom books.

>>	Anonymous Wed Apr 10 23:21:09 2013 No.5676458 >>5676345 No it doesn't work like that, you have to use the sine subtraction formula: Sin(A-B)=CosACosB+SinASinB and then use the double angle formula want me to do it and get back to you?

>>	Anonymous Wed Apr 10 23:24:53 2013 No.5676464 >>5676399 2@-@ does equal @, but Sin(2@-@) doesn't equal sin@

>>	Anonymous Wed Apr 10 23:25:39 2013 No.5676467 >>5676464 And here we go.

>>	Anonymous Wed Apr 10 23:26:24 2013 No.5676468 >>5676458 Yes, please. I don't want to waste my own time.

>>	Anonymous Wed Apr 10 23:34:23 2013 No.5676490 >>5676458 I thought it was: Sin(A+B)=cosAsinB+cosBsinA

>>	Anonymous Wed Apr 10 23:41:39 2013 No.5676502 >>5676468 Ends up being -Sec@ sorry I was doing other work too

>>	Anonymous Wed Apr 10 23:42:38 2013 No.5676504 >>5676490 yeah it is actually I didn't remember it correctly but when I expressed it I pulled out my reference sheet

>>	Anonymous Wed Apr 10 23:57:53 2013 No.5676531 >>5676381 Wow that's gay, how much are they? Maybe they're doing it to save the students money (but inadvertently fucking over cheap students who rely on piratebay)?

>>	Magnelec Thu Apr 11 17:58:56 2013 No.5678069 >>5676458 wrong formula kid. go back to highschool >>5676345 OP stop being so OP and explain to us what you need to solve. You just posted some random crap

>>	Anonymous Thu Apr 11 18:59:41 2013 No.5678322 http://www.wolframalpha.com/input/?i=sin%282theta+-+theta%29

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