EPQP's answer to Help's Secondary 3 E Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
EPQP
Epqp's answer
392 answers (A Helpful Person)
1st
Period = 1/frequency = 0.5 second. Hence you're expected to draw up to 1 second.