Solving trigonometric equations using sum and difference identities

Everything you need for JC, LC, and college level maths and science classes.

We’ve mastered the national curriculum so that you can revise with confidence.

24/7 access to the best tips, walkthroughs, and practice exercises available.

0/2

Utilizing "Sum and Difference Identities" to solve:
1. $\sin (x + {\pi \over 4} ) + \sin (x - {\pi \over 4} ) = -1,$
  general solution in degrees
2. $\cos 3x \cos x + \sin 3x \sin x =0,$
  $0 \leq x$ < $2\pi$

No Javascript

It looks like you have javascript disabled.

You can still navigate around the site and check out our free content, but some functionality, such as sign up, will not work.

If you do have javascript enabled there may have been a loading error; try refreshing your browser.