d all values of a in (0,360) that satisfy the equation. use degree measure
4qurt3cos2a-6=0
the solution set is?
math question 2
2007-10-17 6:26 pm
回答 (1)
2007-10-18 2:46 am
✔ 最佳答案
4√(3cos2a) -6=04√(3cos2a) = 6
√(3cos2a) = 3/2
(3cos2a) = 9/4
cos2a = 3/4
cos2a = 1 - 2sin^2 a = 3/4
.'. sin^2 a =1/8
sina = 1/√8
sina = 20.7 'or 159.3 '
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