The functions are and
Find intersection points.
\Substitute in
.
At ,
At ,
The intersection points are and
.
The functions is .
Apply derivative on each side with respect to .
Use the power rule of derivative :
Use the constant rule of derivative :
The slope .
At point slope is
.
The slope point form is .
Substitute in
.
At point the tangent line is
The slope .
At point slope is
.
The slope point form is .
Substitute in
.
At point the tangent line is
The functions is .
Apply derivative on each side with respect to .
Use the power rule of derivative :
The slope .
At point slope is
.
The slope point form is .
Substitute in
.
At point the tangent line is
The slope .
At point slope is
.
The slope point form is .
Substitute in
.
At point the tangent line is
Graph:
\Observe from the graph :
\Both the tangents are orthogonal to each other.
\.