I have guessed that the coordinates of C is (340,0), which is correct, but is there any 'formal' way of working out the coordinates of C?(b) The diagram shows part of the curve with equationy=cos(px−q)° , wherepandqare positive constants andq<180. The curve cuts thex-axis at pointsA,BandC, as shown.

Given that the coordinates ofAandBare (100, 0) and (220, 0) respectively:

(i) Write down the coordinates ofC.

(ii) Find the value ofpand the value ofq.

Also can someone show me how to work out the vales of p and q?

thank you.