How to work out Sin, Cos and Tan on my iphone? I don't have a scientific calculator?

In year 10 math we're learning trig and we have to use a calculator. But I don't own a scientific calculator as it is too expiensive to buy. So i use my Iphone, but it won't work. Someone help!

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https://itunes.apple.com/...75190?mt=8

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