Show that sin2A is equal to 2sinAcosA

This question requires you to use the trigonometric identity sin(A+B)=sinAcosB + sinBcosA. The difficulty in this problem is noticing that you need to substitute 2A for A+A and then you can simply put this into the trig identity. Doing this leads to you sin2A=sinAcosA + sinAcosA which is 2sinAcosA.

Answered by Samuel L. Maths tutor

31820 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Differentiate, with respect to x, e^3x + ln 2x,


Find the coordinates of the stationary point on the curve y=2x^2+3x+4=0


Differentiate (x^0.5)ln(x) with respect to x.


y = 3x^2 + 2x^(1/2) - 12 Find dy/dx


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