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Pre-calc formulas and Identities
several misy know identities for pre-calc
12
Mathematics
11th Grade
11/15/2010
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Term
sin(2x)
 Definition
2sinxcosx
Term
cos2x
 Definition
cos^2x-sin^2x
2cos^2x-1
1-2sin^2x
Term
tan2x
 Definition
2tanx/1-tan^2x
Term
sin^2x
 Definition
1/2(1-cos(2x))
Term
cos^2
 Definition
1/2(1+cos(2x))
Term
tan^2x
 Definition
1-cos(2x)/1+cos(2x)
Term
sin(a+b)
 Definition
sinAcosB+cosAsinB
Term
co(A+B)
 Definition
cosAcosB-sinAsinB
Term
tan(A+B)
 Definition
tanA+TanB/1-tanAtanB
Term
sin(x/2)
 Definition
+/- (squareroot over all) (1-cos)/2
Term
cos x/2
 Definition
squareroot over all (cos+1)/2
Term
tan x/2
 Definition
1-cosx/sinx
sinx/1+cosx
1-cos2x/1+cos2x
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