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*cotx=cosx/sinx *secx=1/cosx *cosecx=1/sinx *(cos2)x + (sin2)x = 1;Where x is in  degrees: *sin(90-x) = cosx *cos(90-x) = sinx *tan(90-x) = cotx *cot(90-x) = tanx *sin(180-x)= sinx *cos(180-x)=-cosx *tan(180-x)=-tanx *cot(180-x)=-cotx *sin(180+x)=-sinx *cos(180+x)=-cosx *tan(180+x)= tanx *cot(180+x)= cotx *sin(360-x)=-sinx *cos(360-x)= cosx *tan(360-x)=-tanx *cot(360-x)=-cotx *sin(-x) =-sinx *cos(-x) = cosx *tan(-x) =-tanx *cot(-x) =-cotx *sin(x+y) = sinxcosy + cosxsiny *sin(x-y) = sinxcosy - cosxsiny *cos(x+y) = cosxcosy - sinxsiny *cos(x-y) = cosxcosy + sinxsiny