Algebra and Trigonometry, 8th edition
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55
| PAGE: 508 | SET: Exercises | PROBLEM: 55 |
Please look in your text book for this problem Statement
The trigonometric function is 
.
Let 
, then 
.
From the definition of inverse tangent function :
If then 
.
Draw the right angled triangle :
From Pythagorean theorem,
The square of the hypotenuse is equal to sum the squares of the other two sides.
.
From the above figure : 
.
.
Substitute in 
.
Properties of inverse trigonometric function: 
.
.
Thus, 
.
.
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