write 2(sin^2(x)- cos^2(x)) + 6 sin(x) cos(x) in terms of cos(2x) and sin(2x)

We use the following double angle formulae cos(2x) = cos^2(x) - sin^2 (x) and sin(2x) = 2sin(x)cos(x) to see that 2(sin^2(x)- cos^2(x)) + 6 sin(x) cos(x) = -2-(sin^2(x)+ cos^2(x)) + 3*2 sin(x) cos(x) = -2cos(2x) + 3sin(2x)

NR
Answered by Nicola R. Maths tutor

5005 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Integrate cos(4x)+16x^3 with respect to x


Using the limit definition of the derivative, find the derivative of f(x)=sin(3x) at x=2π


Express 2/P(P-2) in Partial Fractions (C4)


Solve these simultaneous equations: 2x+y-5=0 and x^2-y^2=3


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:

© 2025 by IXL Learning