FORMULAS TO KNOW

Here is a list of all the formulas on the wiki, that way they are all in one place and you won't have to search through the pages :)

SUM and DIFFERENCE IDENTITIES
cos(x-y)= cos(x)cos(y)+sin(x)sin(y)
cos(x+y)= cos(x)cos(y)-sin(x)sin(y)

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

tan(x+y)=tan(x)+tan(y)/1-tan(x)tan(y)

tan(x-y)= tan(x)-tan(y)/1+tan(x)tan(y)

DOUBLE ANGLES

sin(2x)= 2sin(x)cos(x)
cos(2x)= cos² x-sin² x
1-2sin² x
2cos² x-1
tan(2x)= 2tan(x)/1-tan² x

HALF ANGLES

external image moz-screenshot.pnghalfangles.png

PYTHAGOREAN IDENTITIES

sin²x+cos²x=1
tan²x+1=sec²x
1+cot²x=csc²x


OUOTIENT IDENTITIES

tanx=sinx/cosx
cotx= cosx/sinx


RECIPROCAL IDENTITIES


sinx=1/cscx
cosx=1/secx
tanx=1/cotx
cscx=1/sinx
secx=1/cosx
cotx=1/tanx

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