Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

How do you find exact value of $cos (pi/ 2)$ ?

1 Answer

May 19, 2016

$cos(pi/2)=0$

Explanation:

For an angle in standard position $cos(theta)=x/r$ (definition).

From the images below, we can see that as $thetararrpi/2$
$color(white)("XXX")x rarr 0$

Which implies that as $theta rarr pi/2$
$color(white)("XXX")cos(theta) rarr 0/r =0$
enter image source here

Related questions

See all questions in Trigonometric Functions of Any Angle

Impact of this question

47888 views around the world

You can reuse this answer
Creative Commons License