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Special Trigonometric  Limits

    This topic states the limits of the trigonometric functions and also two very useful limits involving sine and cosine. These special limits can either be proved with L'Hopitals rule or with the squeeze rule. Examples are given which illustrate there usefulness.

Proposition (Special Trigonometric Limits) The following trigonometric limits hold:

special trigonometric limits _gr_1.gif]

Example (Special Trigonometric Limits) Find the limit: special trigonometric limits _gr_2.gif]

    Solution. We have
    
special trigonometric limits _gr_3.gif]

Example (Special Trigonometric Limits) Find the limit: special trigonometric limits _gr_4.gif]

    Solution. We have

special trigonometric limits _gr_5.gif]

special trigonometric limits _gr_6.gif]

special trigonometric limits _gr_7.gif]

special trigonometric limits _gr_8.gif]

special trigonometric limits _gr_9.gif]

special trigonometric limits _gr_10.gif]

Example (Special Trigonometric Limits) Find the limit: special trigonometric limits _gr_11.gif]

    Solution. We have

special trigonometric limits _gr_12.gif]

special trigonometric limits _gr_13.gif]

special trigonometric limits _gr_14.gif]

special trigonometric limits _gr_15.gif]

special trigonometric limits _gr_16.gif]

special trigonometric limits _gr_17.gif]

Example (Special Trigonometric Limits) Find the limit: special trigonometric limits _gr_18.gif]

    Solution. We have

special trigonometric limits _gr_19.gif]

special trigonometric limits _gr_20.gif]

special trigonometric limits _gr_21.gif]

(using special trigonometric limits _gr_22.gif] and since special trigonometric limits _gr_23.gif] as special trigonometric limits _gr_24.gif] we infer that special trigonometric limits _gr_25.gif] so we continue)

special trigonometric limits _gr_26.gif]

special trigonometric limits _gr_27.gif]
special trigonometric limits _gr_28.gif]

Cite this as:
Special Trigonometric Limits
Published by Library of Math -- Online math organized by subject into topics.
Written by Smith, David A.
http://www.libraryofmath.com/special-trigonometric-limits.html
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