SOLUTION: solve each equation 15) sin(2 theta) +sin( 4 theta) = 0

Question 712339: solve each equation

15) sin(2 theta) +sin( 4 theta) = 0
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
sin(2 theta) +sin( 4 theta) = 0
sin2x +sin4x =0
sin2x+2sin2x+cos2x=0
sin2x(1+cos2x)=0
sin2x=0
2x=0
x=0
or
1+cos2x=0
cos2x=-1
2x=3π/2
x=3π/4
RELATED QUESTIONS
Solve the equation sin(theta)+cos(theta)= 2(sin(theta)- cos(theta)), for 0 (answered by lwsshak3,KMST)
A)write the equation cos(2 theta)-sin(theta)=0 in terms of sin (theta) B) Hence solve... (answered by stanbon)
solve each equation 23) 3 - sin theta = cos(2... (answered by lwsshak3)
solve each equation 19) 1 + sin theta = 2cos^2... (answered by lwsshak3)
Using the identity tan theta = Sin theta/Cos theta Solve 2 sin theta + cos theta =... (answered by lwsshak3)
Solve the equation on the interval 0 < theta < 2pi cos^2 theta-sin^2 theta+sin... (answered by tarungehlot)
how to solve: Sin^2 theta Cos^2 theta =... (answered by Alan3354)
1.Given: cos theta = 5/13, theta is in quadrand I. Find:tan theta. 2.Given:sin... (answered by Theo)
solve the equation for 0◦≤ x ≤ 360◦ 4-sin theta= 4 cos ^2 theta.... (answered by stanbon)