# How do you evaluate #sec(cos^-1(1/2))# without a calculator?

##### 2 Answers

Oct 23, 2016

#### Explanation:

Another way, without calculating

Consider a right triangle with an angle

Thus

Note that this same reasoning shows that in general,

Mar 12, 2017

#### Explanation:

Understand that

As we know that, cosine function is the reciprocal of secant function,

#color(brown)(sec(theta)=1/(cos(theta))#

Hope this helps... :)