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Trigonometry – My Grandmother Also Can Do This!

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Tuition given in the topic of E-Maths Tuition Questions from the desk of Miss Loi at 5:39 pm (Singapore time)

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Today’s question looks sooo simple. Just punch those keys on your state-of-the-art Casio scientific calculator and you will get it right … except that this is a Paper 1 question and your favourite Casio calculator should not be there!

So how now? Go ask your Grandma (Ah SOH) with the big foot (TOA CAH) for help lah!

Diagram for this question In the diagram, a ladder BC is leaning against the wall AD. Given that, sin x = 5/13. Find the cosine of angle DCB.

頑張って!!!
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