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Unformatted text preview: α ) positive or negative? (c) Use a fundamental identity to Fnd the exact value of sec( α ). (d) Use a fundamental identity to Fnd the exact value of cos( α ). (e) Use a fundamental identity to Fnd the exact value of sin( α ). (f) Use a fundamental identity to Fnd the exact value of cos(α ). 5. Let β be an angle such that 180 ◦ < β < 270 ◦ and cos( β ) =. 64. (a) Which quadrant does β/ 2 lie in? (b) Find the exact value of cos( β/ 2). (c) Find the exact value of sin( β/ 2). 6. Verify that cos( θ ) csc( θ )sin( θ ) = tan( θ ) . 7. Verify that sin(3 x ) sin( x ) = 4 cos 2 ( x )1 . Hint: To get started, write 3 x = 2 x + x ....
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 Fall '08
 KWON
 exact value

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