Express the product as a sum containing only sines or cosines.sin(6?) sin(3?)
A. 
[cos(9?) - cos(3?)]
B. sin2(18?2)
C. 
[sin(9?) + cos(3?)]
D. 
[ cos(3?) - cos(9?)]
Answer: D
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Evaluate the line integral.
; C is the curve x = e7t, y = e-t, z = et, 0 ? t ? 1
A. 
B. 
C. 
D. 
A tamoxifen study claims that a combination of chemotherapy and the hormone therapy tamoxifen is more effective than tamoxifen alone in preventing breast cancer. In the study, a group of researchers from the U.S. and Canada studied 1477 postmenopausal women with early-stage breast cancer. The women were randomly assigned to one of three study groups. Group A (361 patients) received tamoxifen alone on a daily basis for five years. Group B (566 patients) received chemotherapy and tamoxifen for six months, and then completed five years of tamoxifen treatment. Group C (550 patients) received chemotherapy alone for six months followed by five years of tamoxifen treatment. All 1477 patients knew which treatment they were receiving.This study can best be described as a
A. survey using stratified sampling. B. randomized controlled experiment. C. census. D. survey using quota sampling. E. survey using simple random sampling.
Write in simplest exponent form.2 ? 2 ? 2 ? 2 ? x ? x ? x
A. 6x3 B. 2x7 C. 25x3 D. 24x3
Subtract. Write your answer in lowest terms.
- 
A. 
B. - 
C. 
D. - 