signs of a and b are the same - Answer>>a/b > 0 when
a =b or -a=b - Answer>>|a| = b when
a>b or a<-b - Answer>>|a|> b when
-b<a<b - Answer>>|a|<b when
{x, x≥0 {-x, x <0 - Answer>>|x|
equal eachother - Answer>>slopes of 2 parrallel lines
negative reciprocals - Answer>>slopes of 2 normal lines are
y-b=m(x-a) - Answer>>equation of a line with slope m passing through (a,b)
y=mx+b - Answer>>equation of a line with slope m and y-intercept b is d= √((a-c)² + (b-d)²) - Answer>>distance between 2 points (a,b) and (c,d)
b≠0 - Answer>>restriction on the domain of a/b is
x≥0 - Answer>>restriction on the domain of √x
x>0 - Answer>>restriction of domain of ln x
symmetric to y-axis, or when the point (a,b) is on the
graph so is the point (-a,b) - Answer>>function is even when
symmetric to the origin or when point (a,b) is on the graph so is the point (-a,-b) - Answer>>function is odd when
2sinxcosx - Answer>>sin(2x)
cos²x-sin²x; 2cos²x-1; 1-2sin²x - Answer>>cos(2x)
tanx=sinx/cosx; cotx=cosx/sinx - Answer>>quotient identities
csc=1/sinx; sec=1/cosx; cotx=1/tanx - Answer>>reciprocal identities