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Posted by **Grace** on Saturday, January 2, 2010 at 1:45pm.

sin2x=cos2x

answer choices are:

a.)Pi/8

b.) Pi/8, 5Pi/8, 9Pi/8, 13Pi/8

- Trigonometry -
**drwls**, Saturday, January 2, 2010 at 2:24pmThe solution is tan 2x = 1

2x = arctan 1

2x = pi/4 or (5/4) pi or (9/4) pi or (13 pi/8). You can ignore higher values because of the 2 pi limit on x.

Solve for x

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