# Is cos x sin x = 1 an identity?

##### 2 Answers

Feb 23, 2016

No

#### Explanation:

An easy way to show that this is not an identity is to plug in

In fact, if we use the identity *no* real values for which the questioned equality is true.

Because

The more common trig identity which involves

which is true for all

Feb 23, 2016

My answer;

**Absolutely not**

#### Explanation:

According to this

\ I hope you get the point **IT IS NOT TRUE FOR ALL VALUES OF X**

So it is not an identity