Posted by **John** on Friday, December 16, 2011 at 2:55am.

solve for x, 0 ¡Ü x < 360

tan2x+1=0

My answers: 22.5, 157.5, 202.5, 337.5

Textbook: 67.5, 157.5, 247.5, 337.5

I don't understand. Am I wrong?

Thanks for your help.

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