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| other 2 pythag identities |
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Definition
| 1+cot^2 = csc2, 1+tan2 = sec2 |
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| sin(2ø)=2sinøcosø, cos(2ø)=cos^2(ø)-sin^2(ø), tan(2ø)=2tanø/1-tan^2ø |
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| area = squrt(s(s-a)(s-b)(s-c) where s = half the perimiter |
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Definition
| x(t) = (vocosø)t, y(t) = -16t^2 + (vosinø)t +yo |
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Definition
| r^2 = x^2+y^2, rsinø=y, rcosø=x, tanø=y/x |
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Definition
| c/1+a x b^x, or c / 1+a x e -kx (c never changes) |
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| exponential growth and half life |
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Definition
| p(t) = po(1+r)^t, y=yo(1/2)t/n where t = time and n = years per half life |
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Definition
| logb1=0, logbb=1, logbb^y=y, b^(logbx)=x |
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Definition
| 1/2bcsinA = 1/2absinC etc |
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| financial things to remember |
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Definition
| n = times per year, p = principle amount, r = rate (percent) |
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| sequence things to remember |
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Definition
| n = number of terms, d = +/-, r = x. also, Sn is for finite arithmetic and geometric, but that special one is or infinite geometric with |r|<1 |
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