Express cos(2x) in terms of acos^2(x) + b

cos(2x)=cos2(x) - sin2(x)use sin2(x) = 1 - cos2(x)so cos(2x)=cos2(x) - (1 - cos2(x))cos(2x)=2cos2(x) - 1so a = 2 and b = -1

Answered by Maths tutor

3093 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

How do I tell if a curve has a maximum or a minimum?


What is differentiation and how do I do it?


How and when should I integrate by parts?


A curve has the equation 6x^(3/2) + 5y^2 = 2 (a) By differentiating implicitly, find dy/dx in terms of x and y. (b) Hence, find the gradient of the curve at the point (4, 3).


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences