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Pre-calc Identities
Trig Identities
23
Other
Undergraduate 1
11/18/2014
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Term
csc(x)=
 Definition
1/sin(x)
Term
sec(x)=
 Definition
1/cos(x)
Term
cot(x)=
 Definition
1/tan(x)
Term
tan(x)=
 Definition
sin(x)/ cos(x)
Term
cot(x)=
 Definition
cos(x)/ sin(x)
Term
sin2(x)+cos2(x)=
 Definition
1
Term
tan2(x)+1=
 Definition
sec2(x)
Term
1+cot2(x)=
 Definition
csc2(x)
Term
sin(x+y)=
 Definition
sin(x)cos(y)+cos(x)sin(y)
Term

sin(x-y)=

 

 Definition

sin(x)cos(y)-cos(x)sin(y)

 
Term
cos(x+y)=
 Definition
cos(x)cos(y)-sin(x)sin(y)
Term
cos(x-y)=
 Definition

cos(x)cos(y)+sin(x)sin(y)

 
Term
tan(x+y)=
 Definition

tan(x)+tan(y)

1-tan(x)tan(y)
Term
tan(x-y)=
 Definition

tan(x)-tan(y)

1+tan(x)tan(y)
Term
sin(2x)=
 Definition
2sin(x)cos(x)
Term
cos(2x)=
 Definition
cos2(x)-sin2(x)
Term
tan(2x)=
 Definition

2tan(x)

1-tan2(x)
Term
sin2(x)=
 Definition

1-cos(2x)

2
Term
cos2(x)=
 Definition

1+cos(2x)

2
Term
tan2(x)
 Definition

1-cos(2x)

1+cos(2x)

 
Term
sin(x/2)=
 Definition

√1-cos(x)

2
Term
cos(x/2)=
 Definition

√1+cos(x)

2
Term
x/2
 Definition
in quadreant 1
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