Question

rectify x=a(cos t+ sin t),y=a(sin t- t cos t) from t=0 to t=2

Answer 1

cos 0=1
sin0=0

t=0:
x=a(cos0+sin0)=a(1+0)=a
same for y

t=1:
x=a(cos1+sin1)
same for y.

same for t=2