Before getting stuck into the functions, it helps to give a name to each side of a right triangle:. Sine , Cosine and Tangent often shortened to sin , cos and tan are each a ratio of sides of a right angled triangle:. Divide the length of one side by another side. Good calculators have sin, cos and tan on them, to make it easy for you. Just put in the angle and press the button. You can read more about sohcahtoa
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