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Question

What is the value of cos60?

A
1
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B
0
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C
2
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D
12
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Solution

The correct option is C 12
Let ABC be a right angled triangle wit right angle at A, ABC=600,BCA=300
Let AB=a
BC=2a, AC=3a
Cosine of an angle is the ratio of adjacent side and the hypotenuse
cos60o=ABBC=a2a=12

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