# What is the equation of the tangent line of #r=sintheta + costheta# at #theta=pi/2#?

##### 1 Answer

Sep 4, 2016

For the inward normal,

#### Explanation:

Here,#

This represents the circle with center at the pole r = 0 and diameter

sqrt2. The radius is

diameter ,

The normal at a point on the circle is along the radius to the point.

Thus, the radial line

under reference,

For the inward normal, the equation is