a) Express 4(cosec^2(2x)) - (cosec^2(x)) in terms of sin(x) and cos (x) and hence b) show that 4(cosec^2(2x)) - (cosec^2(x)) = sec^2(x)

A) 4(cosec2(2x)) - (cosec2(x)) = 4/(sin2(2x)) - 1/(sin2(x)) = 4/[(2 sin(x) cos(x))2] - 1/(sin2(x)) B) 4/[(2 sin(x) cos(x))2] - 1/(sin2(x)) = 4/(4 sin2(x) cos2(x)) - 1/(sin2(x)) = 1/(sin2(x) cos2(x)) - cos2(x)/[sin2(x)cos2(x)] = {Using 1 - cos2(x) = sin2(x)} = sin2(x)/(sin2(x)cos2(x)) = 1/(cos2(x)) = sec2(x)

Answered by Mario R. Maths tutor

17714 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

What are the different steps involved in Proof by Induction?


A curve has parametric equations: x = 3t +8, y = t^3 - 5t^2 + 7t. Find the co-ordinates of the stationary points.


A trolley of negilible mass on horizontal tracks is at rest. A person of mass 50kg is standing on the trolley with a bag of mass 10kg. The person throws the bag off the trolley horizontally with a velocity of 3m/s. Calculate the velocity of the man.


How to sketch a cubic function


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences