Plzz tell question no 20
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/respected-sir-maam-or-dear-friend-a-man-in-a-boat-row/some-applications-of-trigonometry/12303537
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https://www.meritnation.com/ask-answer/question/respected-sir-maam-or-dear-friend-a-man-in-a-boat-row/some-applications-of-trigonometry/12303537
Regards