Formulas+to+Know

=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 :)

cos(x-y)= cos(x)cos(y)+sin(x)sin(y) cos(x+y)= cos(x)cos(y)-sin(x)sin(y)
 * __SUM and DIFFERENCE IDENTITIES __**

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__**

__**PYTHAGOREAN IDENTITIES **__

sin ²x+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