- #1
i_m_mimi
- 17
- 0
1. Sin^2(x) = 3 – x
Answer: 2.97
Attempts:
1-cos^2(x) = 3 – x
cos^2(x) - x + 2 = 0
Factored it and got x = pi = 3.14
It’s a multiple choice question, and other answers were 3.02,3.09 which are few decimal places off so the answer must not be pi since it's not even a choice. Is the answer key wrong or what?
2. logx = 2 cos x, 0<x<2pi
Answer: 1.38, 5.07
Attempts:
plug and chugged multiple choice answers, don't understand it
sin2x = 2sinxcosx
cos2x = 2cos^2(x) - 1
cos2x = 1 - 2sin^2(x)
1 = cos^2(x) + sin^2(x)
some other trigonometric identities
Thanks
Answer: 2.97
Attempts:
1-cos^2(x) = 3 – x
cos^2(x) - x + 2 = 0
Factored it and got x = pi = 3.14
It’s a multiple choice question, and other answers were 3.02,3.09 which are few decimal places off so the answer must not be pi since it's not even a choice. Is the answer key wrong or what?
2. logx = 2 cos x, 0<x<2pi
Answer: 1.38, 5.07
Attempts:
plug and chugged multiple choice answers, don't understand it
Homework Equations
sin2x = 2sinxcosx
cos2x = 2cos^2(x) - 1
cos2x = 1 - 2sin^2(x)
1 = cos^2(x) + sin^2(x)
some other trigonometric identities
Thanks