Peer Review for material titled "Just a technic ,not a proof ."
eTextbook Reviews for material titled "Just a technic ,not a proof ."
User Rating for material titled "Just a technic ,not a proof ."
Member Comments for material titled "Just a technic ,not a proof ."
Bookmark Collections for material titled "Just a technic ,not a proof ."
Course ePortfolios for material titled "Just a technic ,not a proof ."
Learning Exercises for material titled "Just a technic ,not a proof ."
Accessibility Info for material titled "Just a technic ,not a proof ."
Please limit Bookmark title to 65 characters
Please limit Bookmark title to 4000 characters
A Bookmark with this title already existed.
Please limit Bookmark title to 65 characters
Please limit Bookmark title to 4000 characters
A Bookmark with this title already existed.
Search all MERLOT
Select to go to your profile
Select to go to your workspace
Select to go to your Dashboard Report
Select to go to your Content Builder
Select to log out
Search Terms
Please give at least one keyword of at least three characters for the search to work with. The more keywords you give, the better the search will work for you.
Select OK to launch help window
Cancel help
```

```

# Just a technic ,not a proof .

`        `
Rate this material with
star
Rate This:
/merlot/images/apricotstars/
User average rating of
User average rating of
We could not retrieve the rating, please try again.
Failed to retrieve material ID, please try again.
Thank you for interest in the material.
MERLOT only allows 5 ratings an hour from a non-logged in user.

## Just a technic ,not a proof .

Just a technic ,not a proof .One of the students asked me if he could calculate lim sin(x)/x (x---> 0) by Hopital’s law as following. lim sin(x)/x (x---> 0) = lim (sin(x))’/(x)’ (x---> 0) = lim cos(x)/1 (x---> 0) = 1. I answered him “that is only a technic not a proof .To prove that derivative of sin(x) is equal to cos (x) ,it is necessary to know that lim sin(x)/x (x---> 0)=1,in other words in a logical ordering ,we can’t use Hopital’s law . Not only in this case but also... More
Technical Format: Website
Date Added to MERLOT: May 06, 2010
Date Modified in MERLOT: August 30, 2017
Keywords: calculus

### Quality

• Reviewed by members of Editorial board for inclusion in MERLOT.
Editor Review (not reviewed)
• User review 0 average rating
• User Rating (not rated)
• Learning Exercises (none)
• Bookmark Collections (none)
• Course ePortfolios (none)
• Accessibility Info (none)

• Rate This:
• Create a Learning Exercise
• Pick a Bookmark Collection or Course ePortfolio to put this material in or scroll to the bottom to create a new Bookmark Collection
Name the Bookmark Collection to represent the materials you will add
Describe the Bookmark Collection so other MERLOT users will know what it contains and if it has value for their work or teaching. Other users can copy your Bookmark Collection to their own profile and modify it to save time.
Edit the information about the material in this {0}
Submitting Bookmarks...

Primary Audience: High School
Mobile Platforms: Not specified at this time
Language: English
Cost Involved: no
Source Code Available: unsure
Accessibility Information Available: unsure
Creative Commons: unsure
Browse in Disciplines:

```