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The value of the trigonometric function , and the interval is .
Double-angle formulas : ,
(or) ,
.
Find the value of by using Pythagorean identity.
Pythagorean identity : .
The angle is in the interval .
Since sine function is negative in fourth quadrant, .
The value of .
The value of .
Quotient identity : .
The value of .
The values of , , and .
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