Prove that 13 cos x + 3 sin x = 13
Your help will be much appreciated!
Thank you
Oh yes, I better rephrase the question. It actually says 'show that...'
Except showing it's in the range, is there a way I can somehow get the left hand side of the equation to equal the right? The question is worth five marks and it seems to me they want me to show the working that makes left(13 cos x + 3 sin x) stripped down to 13. 0_0