SOLUTION: (sinx+cosx)²=3/4.Find cos²2x.
Algebra.Com
Question 1104682: (sinx+cosx)²=3/4.Find cos²2x.
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
(1) Expand the expression on the left in the given equation.
Then
Then find (cos(2x))^2 using
RELATED QUESTIONS
(sinx+cosx)²=3/4.find... (answered by greenestamps)
If sinx + cosx = 3/4 find sinx -... (answered by Alan3354)
3-cosx=3sin^2x... (answered by stanbon)
sinx=3/4, tanx=9/2... (answered by ewatrrr)
if sinx + cosx = 4/3 then sin2x =... (answered by ikleyn)
Verify the following trig identities
1) sin^2x/cosx=secx-cosx
2) 1+sinx/1-sinx -... (answered by lwsshak3)
Cosx-4=... (answered by Fombitz)
(sinx)(cosx)(tanx)+(cos^2x)=1 (answered by Alan3354)
simplify:
sinx . cosx . cos 2x
Thank... (answered by mouk)