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Sine, Cosine and Tangent are the three main functions in trigonometry. They are based on right-angled triangle.They let you know about angles.for example The angle the sailing boat makes with the seabed or slope, curves in case of a tree etc.
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Sine, Cosine and Tangent are the three main functions in trigonometry.
They are often shortened to sin, cos and tan.
To calculate them:
Divide the length of one side by another side
... but you must know which sides!
For a triangle with an angle θ, the functions are calculated this way:
Sine Function:
sin(θ) = Opposite / Hypotenuse
Cosine Function:
cos(θ) = Adjacent / Hypotenuse
Tangent Function:
tan(θ) = Opposite / Adjacent
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These are functions of trigonometry.  
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