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Side A ------ Side B
cos2x+sin2x= ------ 1
sin2x= ------ 1-cos2x
cos2x= ------ 1-sin2x
cos(x2-x1)=
cos(x2+x1)= ------ cosx2cosx1+sinx2sinx1
cosx2cosx1-sinx2sinx1
cos(-x)= ------ cosx
sin(-x)= ------ -sinx
cos(pi/2-x)= ------ sinx
sin(pi/2-x)= ------ cosx
sin(x2-x1)=
sin(x2+x1)= ------ sinx2cosx1-cosx2sinx1
sinx2cosx1+cosx2sinx1
 
cos2x= ------ cos2x-sin2x
1-2sin2x
2cos2x-1
sin2x= ------ 2sinxcosx
tanx- ------ sinx/cosx
tan2x= ------ 2tanx/1-tan2x
tan(x2+x1)
tan(x2-x1) ------ sin(x2+x1)/cos(x2+x1) or tanx2+tanx1/1-tanx2tanx1
 tanx2-tanx1/1+tanx2tanx1