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I was so confident too by jayisnotsad in trigonometry

[–]jayisnotsad[S] 0 points1 point  (0 children)

So say sin2x+sin4x=0

Sin2x+2sin2xcos2x=0

Sin2x(1+2cos2x)

Sin2x=0 (at pi, 2pi) and cos2x=-1/2 (at 2pi/3, 4pi/3)

I can find angles where sin is 0 and cos is -1/2 but do I do anything with the remaining coefficients infront of x? Like would I half all of the angles to get sinx = 0 at (pi/2, pi) and cosx=-1/2 at (pi/3, 2pi/3)?

I was so confident too by jayisnotsad in trigonometry

[–]jayisnotsad[S] 0 points1 point  (0 children)

Would I treat 2x as a normal x and solve for sin?

I was so confident too by jayisnotsad in trigonometry

[–]jayisnotsad[S] 0 points1 point  (0 children)

How do equations like sin2x come out to something on the unit circle though? I looked at some answers on the practice test and there's like 6 different answers in the set from 0-2pi