HELP: Physics Homework Problem!?

luvmyfriends818

New member
Help, please! =)

Two sinusoidal waves in a string are defined by the functions
y1 = (2.00 cm) sin (20.0x - 32.0t)
and
y2 = (2.00 cm) sin (25.0x - 40.0t)

What is the positive x value closest to the origin for which the two phases differ by +/- pi at t = 2.00s? (This location is where the two waves add to zero.)
 
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