Please answer these questions

Q.1A string of l length is strung from the ceiling, with a weight of m mass attached to the bottom end, and it is vibrated from side to side. At time t the weight is in the position shown in the figure. When taking the xy coordinates as shown in the figure, the position of the weight r(t), velocity v(t), and acceleration a(t) at time t are each

r(t)=(
+
cos?(t)+
sin?(t),
+
cos?(t)+
sin?(t)),

v(t)=(
+
cos?(t)+
sin?(t),
+
cos?(t)+
sin?(t)),

a(t)=(
+
cos?(t)+
sin?(t),
+
cos?(t)+
sin?(t))

and the first one is

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