Solve sin(2x) = cos(2x)

  • Thread starter Thread starter qweqwe
  • Start date Start date
Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
Sign up Log in
3 replies · 10K views
qweqwe
Messages
1
Reaction score
0
Solved thanks
 
Last edited:

Discussion

Physics news on Phys.org
qweqwe said:
solve the equation sin(2x) = cos(2x)

Tried using the double angle formula

Too much work! Make a simple substitution so you can solve the equation sin(u)=cos(u).
 
If you show what you have done we can help you find the mistake.
 

Similar threads

Solve for all angles x: cos(2x) + cos(x) = 0, where 0<x<2pi

  • Ascendant0
  • · Replies 25 ·
  • Precalculus Mathematics Homework Help
Replies
25

Proving Sin x + Sin 2x + Cos x + Cos 2x = 2√2cos(x/2)sin(3x/2+π/4)

  • stfz
  • · Replies 2 ·
  • Precalculus Mathematics Homework Help
Replies
2

Signs of sin 2x, cos 2x, tan 2x from sin x = -3/5 in quadrant III

  • kieth89
  • · Replies 6 ·
  • Precalculus Mathematics Homework Help
Replies
6

Prove trig identity (cot x -1)/(cot x +1)=(1-sin 2x)/(cos 2x)

  • karush
  • · Replies 3 ·
  • General Math
Replies
3

Graph Sin(2x+6): Is Parent Function the Best Option?

  • barryj
  • · Replies 6 ·
  • Precalculus Mathematics Homework Help
Replies
6

Solving sin 2x = -cos 2x

  • angel_4_ever3
  • · Replies 3 ·
  • Precalculus Mathematics Homework Help
Replies
3

Solving cos(2x) + cos(x) = 0 for 0° to 360°

  • Helly123
  • · Replies 12 ·
  • Precalculus Mathematics Homework Help
Replies
12

Proving sec(2x) - tan(2x) and cos(2x)/(1 + sin(2x)) identities

  • Hockeystar
  • · Replies 3 ·
  • Precalculus Mathematics Homework Help
Replies
3

Writing sec(2x)csc(x)sin(2x) as a function of cos(x)

  • Mark53
  • · Replies 5 ·
  • Precalculus Mathematics Homework Help
Replies
5

Simplifying Double Angle Formula: Cos^2 8x - Sin^2x

  • Veronica_Oles
  • · Replies 6 ·
  • Precalculus Mathematics Homework Help
Replies
6