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Math 1321 Quiz 9 Name:
October 30, 2002
Instructions:
1. Be sure to show all your work, NO WORK = NO CREDIT!!
2. Read all questions carefully and be sure to give the result wanted.
3. Box in or highlight your final answer. NO BOX = NO CREDIT
1. Exercise 5.1, Problem 8: Use the eight fundamental relations to write the following as a
single trigonometric expression of some angle.
radicalBigg
1?cos2
parenleftbigg9pi
4
parenrightbigg
Solution:
radicalBigg
1?cos2
parenleftbigg9pi
4
parenrightbigg
=
radicalBigg
sin2
parenleftbigg9pi
4
parenrightbigg
= sin
parenleftbigg9pi
4
parenrightbigg
2. Exercise 5.1, Problem 16: Decide if the following statement is true or false using the eight
fundamental relations. If it is true, cite proof. If it is false, correct it.
cos7B
sin7B = cotB
Solution:
cos7B
sin7B = cot7B negationslash= cotB
To correct the problem, change cotB to cot7B.
3. Exercise 5.1, Problem 28: Decide if the following statement is true or false using the eight
fundamental...

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