Posted by **Emma** on Monday, January 7, 2013 at 5:02pm.

Prove that

tanx+cotx=2sec(2x)

Thank you! :)

- Trigonometry -
**Reiny**, Monday, January 7, 2013 at 5:14pm
LS = sinx/cosx + cosx/sinx

= (sin^2 x + cos^2 x)/sinxcosx

= 1/(sinxcosx)

= 2/(2sinxcosx)

= 2/sin (2x)

= 2csc (2x)

Your RS = 2sec(2x) which is incorrect

Did you have a typo?

- Trigonometry -
**Emma**, Monday, January 7, 2013 at 5:26pm
Yes I had a typo. Thank you!!

(I don't know how to respond to answers besides this....)

- Trigonometry -
**eva**, Monday, January 7, 2013 at 6:03pm
Why

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