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Pre Cal Formulas/Identities
Identities: Reciprocal, Quotient, Pythagorean, Sum. Other Formulas: Double Angle and Distance from point to line. T = theta
18
Mathematics
12th Grade
03/10/2009
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Term
sinx=
 Definition
1/cscx
Term
cosx=
 Definition
1/secx
Term
tanx=
 Definition
1/cotx
Term
cscx=
 Definition
1/sinx
Term
secx=
 Definition
1/cos
Term
cotx=
 Definition
1/tanx
Term
tanx=
 Definition
sinx/cosx
Term
cotx=
 Definition
cosx/sinx
Term
Pythagorean =1
 Definition
cos^2 + sin^2 = 1
Term
Pythagorean = sec^2x
 Definition
1 + tan^2x = sec^2x
Term
Normal Form
 Definition
xcos0 + ysin0 - p = 0
Term
sin(A+B)=
 Definition
sinAcosB + cosAsinB
Term
cos(A+B)=
 Definition
cosAcosB - sinAsinB
Term
tan(A+B)=
 Definition
(tanA + tanB)/(1 - tanAtanB)
Term
sin(2T)=
 Definition
2cosTsinT
Term
cos(2T)=
 Definition
cos^2T - sin^2T
Term
tan(2T)=
 Definition
(2tanT)/(1 - tan^2T)
Term
Distance between Point/Line
 Definition
(A(x1) + B(y1) + C)/+-square root of(A^2 + B^2)
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