math
posted by yanxin .
The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s = 4 sin ¦Ðt + 3 cos ¦Ðt, where t is measured in seconds.
(a)Find the average velocity during each time period.
(i) [1, 2]
(ii) [1, 1.1]
(iii) [1, 1.01]
(iv) [1, 1.001]
(b) Estimate the instantaneous velocity of the particle when t = 1.

On both my Mac and my PC your equation
s = 4 sin ¦Ðt + 3 cos ¦Ðt
came out with strange symbols that I could not read.
Are the π or √ or something else ?