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C4 differentiation q

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Can someone pleasee help me with 11 part a!! First we do 0=sin2t , but then we don't have the upper limit for t so how do we know which value to chose???? It used 2t = π in the answer but why not zero or ??
Yup I did.. They reached 2t=π which is my question :frown:
Original post by pondsteps
Yup I did.. They reached 2t=π which is my question :frown:


Because if t=0t=0 then you have (0,0)(0,0) which finds you OO. Now AA is clearly not OO and in fact it is the next time y=0y=0 which brings us to 2t=π2t=\pi

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