Hello! Remember that a one-one function means any value of x gives ONLY 1 VALUE of y. As for the 2nd part, just calculate carefully. Cheers!

Thx so much! You are such a good tutor

Thanks! Hope you could understand my solutions.

Here you go

Sorry, the (b) should be (d).

Its ok. Thanks again

But i still dont understand (b)?

Thank you but i still dont understand part (b)

Thank you but i still dont understand part (a)

(a) makes use of the trigo identity sin^2(x)+cos^2(x)=1

Oh ya. I forgotten. Thanks again

Sorry but can also explain part (d)?

How do you get 1/sin(x) from sec(x)/tan(x)?

sec(x)=1/cos(x) tan(x)=sin(x)/cos(x)

To find displacement, integrate velocity. To find +c in the displacement equation, sub when t=0, d=0.

To find time at point A and B, at stationary means velocity =0

How about c and d?

Find the distance for the first 4 seconds. Then add them up. Take note displacement and distance are 2 different terms

Find acceleration. When acceleration=0, find time taken. Using the time taken results, find the displacement. Then judge ur answer with evidence.

But I can't get the answer

I also can't get the answer

a) plot point B(x,y) on the graph

Gradient of AB= [(yA)-(yB)]/[(xA)-(xB)]

Plot all the points on a graph paper.