I thought the same, marked D but unfortunately the answer is A.

hmm that’s odd because for the answer to be A, it would be sin ://

Cambridge likes to use tricky words.

it says line at 90 deg to the bank, not 90 deg from the bank.

Use the other side of the bank and you will get the answer. cos-1(4/5)

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please share it as soon as possible

please solve this question in detail.It is causing difficulty in understanding.Please help me understand this question.