# Cosine Functions In Excel

#### Gepard

##### New Member
Hi,

How come Cos(radians(90)) = 6E-17 when it should be 0?

Regards,

### Excel Facts

Square and cube roots
The =SQRT(25) is a square root. For a cube root, use =125^(1/3). For a fourth root, use =625^(1/4).

#### delaneyjm

##### Well-known Member
This is a common occurrence: expecting zero and getting very close to it. It
all has to do with IEEE 754 and the way Excel (and most other computer apps)
convert decimal numbers (numbers using base 10) to binary numbers (numbers
using base 2).

Only a problem with real numbers (i.e. numbers with decimal places) not with
integers

How to avoid: round to 12 decimal places =ROUND(COS(RADIANS(90)),12)
You handheld calculator does this automatically, so you never see it with
that machine

</pre>

#### Gepard

##### New Member
Excellant - many thanks.

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