Prove that 2cot2x+tanx=cotx

2cot2x= 2(1/tan2x)= 2(1/(2tanx/1-tan2x))=2(1-tan2x)/2tanx= (1-tan2x)/tanx(1-tan2x)/tanx +tanx=(1-tan2x)/tanx +tan2x/tanx=1/tanx=cotx

AD
Answered by Alisa D. Maths tutor

20882 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

How do you integrate by parts?


How do you find the equation of a tangent to a curve at a certain point, from the equation of the curve?


dh/dt = (6-h)/20. When t=0, h=1. Show that t=20ln(5/(6-h))


Solve the equation x=4-|2x+1|


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2026 by IXL Learning