SOLUTION: please help me (cos x-1)(cos x+1)＝0
Poblem # 2 sen t cos t-cos t=0 problem 3 tan²x +tanx=0 problem# 4 sen²x-2senx+1=0 problem #5 sen 4x cos x=sen x cos 4x
Algebra.Com
Question 1068900: please help me (cos x-1)(cos x+1)＝0
Poblem # 2 sen t cos t-cos t=0 problem 3 tan²x +tanx=0 problem# 4 sen²x-2senx+1=0 problem #5 sen 4x cos x=sen x cos 4x
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
please help me (cos x-1)(cos x+1)＝0
----
Poblem # 2 sin t cos t-cos t=0
cos(t)(sin(t)-1) = 0
cos(t) = 0 or sin(t) = 1
t = 90 degrees
-----------------------
problem 3 tan²x +tanx=0
tan(x)(3tan(x)-1) = 0
tan(x) = 0 or tan(x) = 1/3
x = 0 degrees or x = arctan(1/3) = 18.43 degrees
-----------------------------
problem# 4 sen²x-2senx+1=0
(sin(x)-1)^2 = 0
sin(x) = 1
x = 90 degrees
--------------------
problem #5 sen 4x cos x=sen x cos 4x
tan(4x) = tan(x)
x = 60 degrees
--------------
Cheers,
Stan H.
-------------
RELATED QUESTIONS
Cos 2x + cos x + 1= 0.... (answered by Alan3354,richard1234)
cos(e^x+1)=0 (answered by tommyt3rd)
Find all t in the interval [0, 2π] satisfying sin x − cos x =... (answered by stanbon,Alan3354)
Fins all exact solutions on (0, pi) for 2 cos^2(t) - 3 cos(t) =... (answered by greenestamps)
please help me solve this problem
verify identities
cos^2(x) cos(x)
------ (answered by stanbon)
cos^2(x)+2cos(x)+1=0 (answered by josgarithmetic)
cos^2(x)+3cos(x)-1=0 (answered by MathLover1)
sen(a)= 8/17, 0 < a < π/2 and cos(B) = 3/5, 0 < B < π/2, cos (a+b)=... (answered by stanbon,ikleyn)
cos 2x + cos x =... (answered by Cromlix)