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Sum/Diff + Double Angle + Alternates
Formulas!
25
Mathematics
10th Grade
10/11/2011
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Term
sin(a+b)
 Definition
sin(a)cos(b) + cos(a)sin(b)
Term
sin(a-b)
 Definition
sin(a)cos(b) - cos(a)sin(b)
Term
cos(a+b)
 Definition
cos(a)cos(b) - sin(a)sin(b)
Term
cos(a-b)
 Definition
cos(a)cos(b) + sin(a)sin(b)
Term
tan(a+b)
 Definition
(tan(a)+tan(b))/(1-tan(a)tan(b)
Term
tan(a-b)
 Definition
(tan(a)-tan(b))/(1+tan(a)tan(b))
Term
cos(90-x)
 Definition
sin(x)
Term
sin(90-x)
 Definition
cos(x)
Term
tan(90-x)
 Definition
cot(x)
Term
cot(90-x)
 Definition
tan(x)
Term
csc(90-x)
 Definition
sec(x)
Term
sec(90-x)
 Definition
csc(x)
Term
1/sin(x)
 Definition
csc(x)
Term
1/cos(x)
 Definition
sec(x)
Term
1/tan(x)
 Definition
cot(x)
Term
sin2x
 Definition
2sin(x)cos(x)
Term
cos2x
 Definition
(cos^2)x - (sin^2)x
OR
1-2(sin^2)x
Term
tan2x
 Definition
2tanx/(1-(tan^2)x)
Term
(sin^2)x
 Definition
(1-cos2x)/2
Term
(cos^2)x
 Definition
(1+cos2x)/2
Term
(tan^2)x
 Definition
(1-cos2x)/(1+cos2x)
Term
sin(a)sin(b)
 Definition
1/2[cos(a-b) - cos(a+b)]
Term
cos(a)cos(b)
 Definition
1/2[cos(a-b) + cos(a+b)]
Term
sin(a)cos(b)
 Definition
1/2[cos(a+b) + cos(a-b)]
Term
cos(a)sin(b)
 Definition
1/2[cos(a+b) - cos(a-b)]
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