Asked by Emma

Prove that
tanx+cotx=2sec(2x)

Thank you! :)
Answered by Reiny
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?
Answered by Emma
Yes I had a typo. Thank you!!

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